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Archive 1

steam engines

"atmospheric engines" use the contraciton of the condensation of steam, not its expansion.


To a physicist there's a fair amount of pseudo-science here - eg power produced by steam - hmm hardly - via steam perhaps. And the reason for the attractiveness of steam as a working medium surely lies in the fact that it's condensible so the pumping power at the cold reservoir temperature cen be very low. There should probably be some link out to the Rankine cycle (eg Zemansky, Heat & Thermodynamics, p224). Linuxlad 23:26, 20 November 2004 (UTC)


Er, why isn't steam a 'fluid', please? All the standard texts I was brought up on, treat is in the same classification as air... Linuxlad 19:53, 3 June 2005 (UTC)


On abzisse you must have für Entropie kJ/kg K. Now its without Kelvin.--82.82.236.1 09:44, 12 June 2005 (UTC)

  • Thanks for that, I fixed it

counter strike source

Shouldnt there be a direction type page because I was looking for a Steam page as in counter strike source and day of defeat, not this. —The preceding unsigned comment was added by Aushog (talk • contribs) 23:43, 15 December 2006 (UTC).

wear vs erosion

I'm no expert on this, but the WP article on erosion is specifically about the action of the weather on geological formations (inc. soil), and hence is not appropriate here. I looked around and found that wear was much closer to the intended meaning, since that article describes the action of both 'solid on solid', but also 'liquid or gas on solid', as intended here.

At present, the link to erosion is utterly wrong. If wear is not correct, it would be better to unlink 'erosion' again.

EdJogg 15:14, 5 January 2007 (UTC)

Try 'wet steam' and erosion together in Google. Bob aka Linuxlad 20:54, 5 January 2007 (UTC)

I do not dispute that 'erosion' is the correct term to use. However, the WP article on erosion, good as it is, does not mention erosion of metal, only the various geological processes, and therefore is not an appropriate link with regard to steam. (And I should know now, as a result of this discussion I've just spent two hours tidying-up that article! Who'd be a WikiGnome?))

The article on 'wear', which is in a much poorer state, is much closer to the meaning of 'erosion' intended here. However, I think the safest course of action for now is to unlink it entirely...so I'll do just that!

EdJogg 01:50, 6 January 2007 (UTC)

Well I'd have thought it more logical to disambiguate erosion into the term (often called erosion/corrosion IIRC) as used by engineers for nigh on a hundred years. Bob aka Linuxlad 09:38, 6 January 2007 (UTC)

I agree completely – linking the word to the WP article corrosion (which is an engineering article) would be much more appropriate than erosion (which is a geology article). Please check out both articles and see which you think is more appropriate... ...and if you decide that corrosion is more appropriate, I will not complain! :o)

EdJogg 10:24, 6 January 2007 (UTC)

Half-Life

(heading added later)--Tunheim 15:24, 16 January 2007 (UTC)

Anything about the Valve Half-Life add on here? Mark Richards 22:15, 10 Jun 2004 (UTC)

Steam invisible?

Uhh, what? Steam is invisible? I was not aware of this.

Edit-Read the part about steam unmixed with air/in a vacuum. Nevermind.

—The preceding unsigned comment was added by HolyHandGrenadez (talk • contribs) 00:27, 12 January 2007.

I'm not so sure a picture of a geyser should be on the steam page. Yes, geysers are associated with steam, but the visible cloud shown consists of liquid water droplets that have formed as the water vapor mixes with the cold air, and portrays an incorrect idea of what is happening. -76.4.49.201 03:25, 29 January 2007 (UTC)

Clouds

Maybe we ought to merge clouds and water with water vapor and steam. or maybe not. its the same stuff in different forms, rite? 68.36.214.143 22:53, 14 May 2007 (UTC)

No. — Omegatron 22:58, 14 May 2007 (UTC)
Agreed, no. - HRS IAM 01:58, 30 July 2007 (UTC)

New steam technology

This has just appeared on the talk:Steam car page. However I think it might be more appropriate to discuss it here.--John of Paris 09:09, 5 September 2007 (UTC)

Perhaps new steam technology (steam production via the blending of methanol and hydrogen peroxide, instead of simple heating) might again propell steam cars. The technology has been produced by Tiancun Xiao and picked up by Oxford Catalysts
See also: * Oxford Catalysts Portable Steam
— Preceding unsigned comment added by 81.245.169.144 (talk • contribs) 16:53, 04 September 2007
The above comment may well have been a bit of 'self-promotion' on the part of Oxford Catalysts, but for those interested in the subject it is certainly worth a look. The reaction they have discovered is little short of 'magic'!
Also available from their site is a Press Release (?) apparently written by a freelance science writer. This gives a better idea about the practical applications of this technology. However, I can't help feeling that a spray applicator for domestic cleaning, that operates at room temperature, and produces a jet of steam at 800degC might be a tad dangerous!! (Their website demo video shows steam igniting a piece of paper!!)
The technology is too new to add anything on this page, but if suitable refs can be found, would be a good addition to the steam page...
EdJogg 17:14, 4 September 2007 (UTC)

Those phase diagrams

The h-s & T-s diagrams are very interesting, but of limited use for ignorant pedestrians without definitions of some of the superimposed curves, if possible right in the associated captions. "X" in particular is obviously important, but no clue is given as to its meaning except that it must be a fraction of something, <100%. Can this be provided somehow, if not in the captions then in the text? thanks -- Wwheaton (talk) 19:57, 2 July 2010 (UTC)

the Mist or Gas edit

I adjusted to convoluted introduction that chose to emphasise the less-common meaning of the term without making it clear that it's actually ambiguous [as per webster dictionary 1913]. It was easy to do this, without resorting to lying-to-children. 203.45.103.88 (talk) 11:08, 31 May 2010 (UTC)

That's definitely an improvement --Old Moonraker (talk) 12:18, 31 May 2010 (UTC)
But we now need anther go, in the "Types of steam and conversion" section. Any knowledgeable volunteer, before I go blundering in? --Old Moonraker (talk) 14:26, 26 July 2011 (UTC)

Expansion volume

The volume increase when water evaporates is stated as 1600 times but if you do a calculation based on the ideal gas law it works out at 1699.47. Either the 1600 should be a 1700 or there is some reason why there is this disparity and the 1600 figure is a measured property. Also, the 1600 isn't referenced. I think the figure should either be corrected to 1700 or explained. — Preceding unsigned comment added by 213.152.45.117 (talk) 18:56, 24 October 2011 (UTC)

Correct use of language

Is "Steam" really the technical term for "water vapor", and not vice-versa? It would be sane to think that the fact that "steam" is actually vaporized water needs some understanding of science and therefore technical knowledge. It is only a suggestion. --186.84.62.33 (talk) 22:55, 7 June 2013 (UTC)

"Steam" has something of an implicit nature of not just being water vapour, but also of being at a raised temperature and pressure over atmospheric, whilst vapour is indeed water in gaseous form, but it's also in equilibrium with the normal atmospheric conditions. When only one of these holds, most obviously above a kettle, it's a bit less clear which is more appropriate to use. Andy Dingley (talk) 23:51, 7 June 2013 (UTC)

My understanding of the ambiguity is: 1. "Steam" is used colloquially to mean the white mist you see from a boiling kettle or from your breath on a cold day. It is not vapor, but tiny droplets of condensed liquid water. 2. Physicists and chemists are usually happy for "steam" to be used colloquially in this way, and to prefer the term "water vapor" to mean water in its vapor phase. Water vapor is colorless, and may, but need not, be mixed with other gases. It does not have to be in equilibrium with anything, it is simply the vapor phase of water. 3. Engineers use "steam" to mean water vapor, usually under pressure. This is the source of the confusion, because there are many practical uses of pressured water vapor, so the word is quite widely used in this sense. One might prefer it if engineers didn't use the word like this, but engineers are busy people, and I never met one who would use six syllables where one would suffice. Dezaxa (talk) 15:46, 27 July 2013 (UTC)

For other uses

Hello User:Vsmith, User:Rklawton and User:Andy Dingley. Recently, you all undid my edit of Steam where I changed the {{other uses}} hatnote into {{About||the software distribution platform|Steam (software)|other uses}} which resulted in a change of "For other uses, see Steam (disambiguation)." into "For the software distribution platform, see Steam (software). For other uses, see Steam (disambiguation)."
In my edit summaries I've tried to explain why I made the change. Note that User:Andy Dingley undid my edit without an explanation (just "Restore original version."), and two of you are administrators. I cannot believe I need to explain to you why the change I made makes sense for various reasons. The Steam (software) article is by far the most popular steam-related article on Wikipedia. I pointed this out in an edit summary and you can verify its popularity yourself here. In October, it was viewed 79 thousand times; averaged over 2,500 views per day. This is not surprising, because, as I also wrote in an edit summary, the Steam software has 100 million active users. I hope you three agree that we try to be user-friendly and try to make it easy for visitors to quickly find the articles they are looking for. There is absolutely no reason to not include a link to the article about the Steam software in the hatnote. Why on earth would we not include a direct link because 'visitors can already reach it via the disambiguation page'; what kind of crazy reasoning is that. The popular - both the service itself and its article - Steam (software) is obviously something that visitors may be seeking instead of the article about the gaseous phase of water, because they share the same name, and, for example, smashing en.wikipedia.org/wiki/steam into a browser gives the article about the latter. Surely you know how popular the Steam software is. If you do not; 75% of games bought on-line for the PC are downloaded through Steam. Welcome to the real world. Who of you three is going to put back the content I tried to add? Of course it should say "For the software distribution platform, see Steam (software). For other uses, see Steam (disambiguation)." Why is there even any discussion necessary about this. This is all very disappointing. --82.136.210.153 (talk) 23:00, 5 November 2014 (UTC)

We do not do this.
We have disambig pages because otherwise the hatnote expands with every other article with a vague overlap and an anon editor to push its viewpoint. We do not do this.
We do not have "secondary" topics that get a privileged status in the hatnote before an otherwise global disambig. We do not do this.
If you claim that Steam (software) is the primary topic, same as the cartoon Magneto is, then seek to rename Steam to Hot wet stuff and rename the gaming platform as Steam alone. See how far you get. Andy Dingley (talk) 23:25, 5 November 2014 (UTC)
Why did you repeat "We do not do this." three times? The Steam software article is not "every other article with a vague overlap", which should be clear by now - but apparently not to you. Why do you think {{About}} even allows me to do what I did; the 'for see ... for other uses see disambiguation'? That's rhetorical. --82.136.210.153 (talk) 23:51, 5 November 2014 (UTC)
Not me, never heard of it. But then I don't reside in the real world of computer gaming. Vsmith (talk) 23:30, 5 November 2014 (UTC)
The edit you undid had the summary "Has 100 million active users. Its WP article has several thousand views a day. In fact, a lot MORE views than this article about the gaseous phase of water." So the platform's popularity should have been clear nonetheless. --82.136.210.153 (talk) 23:54, 5 November 2014 (UTC)
Nope, not clear - more likely simple promotion of a commercial product or so it seemed to me. Vsmith (talk) 00:16, 6 November 2014 (UTC)

So... next month some other Steam is more popular, and the month after - it's something else - and next year some new steam - and each time we're supposed to change the other uses in this article to reflect whatever is trending? In a word, No. Rklawton (talk) 01:49, 6 November 2014 (UTC)

If you look at the (stats.grok.se) statistics, you'll see that Steam (software) has been the most popular steam-related article on Wikipedia for at least four years now, with thousands of daily views. It is not a subject that is trending for a month or two. You could've actually looked into this yourself before writing your "whatever is trending" statement. Why is it that I need to explain this to you? --82.136.210.153 (talk) 11:34, 6 November 2014 (UTC)
I fear you've missed the point. If we look at trending, we have to draw the line somewhere - and then we have to monitor, and monitor, and monitor. The experienced editors here, myself included, would rather just point to the disambiguation page and be done with it. The last thing we want to do is give people yet another avenue to promote their product. Rklawton (talk) 14:32, 6 November 2014 (UTC)
I am (also) an experienced editor. I've been editing WP from various IPs for about 10 years now. I'm afraid it is you who missed the point here. You are the editor who started talking about what is "trending", and you wrote about what is more popular "next month" and "the month after". What I've been pointing out is that Steam (software) has been by far the most popular steam-related article on Wikipedia for years. --82.136.210.153 (talk) 15:13, 6 November 2014 (UTC)

Requests for comment

Consensus appears to be for including Steam (software) in the hatnote. Given the pageview stats identified by Project Osprey, it may even be worth considering a page move based on WP:PRIMARYTOPIC. Number 57 11:55, 9 December 2014 (UTC)

The following discussion is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

This discussion needs input from one or more editors who did not make the changes to (reversions of) the article in question on November 5th. Thanks. 11:44, 6 November 2014 (UTC)

So far we've got one editor who wants to promote software and several admins who don't think that's a good idea. The fact that we removed the promotion doesn't mean we're biased. We're just trying to keep things neutral. Given the overwhelming experience in opposition, this RFC is a waste of time. However, since it's started, let's do it. Rklawton (talk) 14:10, 6 November 2014 (UTC)
Actually, we do have precedent for this (see Inflation), and it's specifically permitted under the disambiguation guideline (WP:2DABS: If a disambiguation page is needed, but one of the other topics is of particular interest, then it may be appropriate to link to it explicitly as well as linking to the disambiguation page.). The IP editor is correct in that the software page has consistently received far higher viewing figures to any of the other disambig pages (including this primary page), and while Google's not the ultimate arbiter of notability, a front page search for "Steam" throws back only one result that isn't about the software. I hate to throw the cat among the pigeons by opposing my fellow admins, but I actually think he has a point. Yunshui 雲水 14:18, 6 November 2014 (UTC)
I don't want to "promote software". What I want is for WP to be user-friendly, and to make it easy for visitors to quickly find the articles they are looking for. You (Rklawton) write you are not biased, but I actually believe you are biased. If the extra link I added to the hatnote wasn't about a company's product, I believe you would not have objected to the change the way you are currently doing, with statements like "one editor who wants to promote software" and "we removed the promotion", and "we're just trying to keep things neutral". Also, your statement about the 'overwhelming opposition' is basically an argumentum ad populum. Given the arguments I've put forth, and the lack of substantive arguments by those opposing the change, this RFC is not a waste of time. --82.136.210.153 (talk) 15:23, 6 November 2014 (UTC)
It's entirely inappropriate to call me biased and tell people what I would do under different circumstances. Rklawton (talk) 18:24, 6 November 2014 (UTC)
You are the person that first mentioned the whole "biased" thing. I wrote that "I actually believe" and that "I believe". Since when am I not free to write what I believe. Nice going on derailing the discussion, by the way. --82.136.210.153 (talk) 18:45, 6 November 2014 (UTC)
The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

We need to fix this situation regarding steam vs. water vapor

The first sentence of this article reads, "Steam is water in the gas phase." The first sentence of the Water vapor article reads, "Water vapor, water vapour or aqueous vapor is the gaseous phase of water." As far as I can tell, this article does not even have a Wikilink to Water vapor, not even in See Also.

What should be done about this? @Dezaxa: made a comment many years ago about how "steam" generally refers to water vapor which has been raised above the ambient temperature and/or pressure, thereby making it a term more relevant to engineering. The term "steam" also appears to be used, at least colloquially, to situations the visible mist of water droplets visible above bodies of water being heated (either by natural or artificial means). However, I do not have any citations on hand to provide actual evidence for the term, except perhaps for an online dictionary like Merriam-Webster [1].

A comprehensive solution would involve both this article and also the Water vapor article. BirdValiant (talk) 21:28, 19 February 2021 (UTC)

Water vapor is simply water in the vapor phase. Just like iodine vapor is iodine in the vapor phase, alcohol vapor is alcohol in the vapor phase, mercury vapor is mercury in the vapor phase, etc. A vapor is a gas that is below its critical point temperature. Water vapor is colorless, so it is invisible in air. If water vapor is cooled and condenses into tiny droplets then it becomes visible as a white 'cloud'. This is what you see when you breathe out on a cold day or when the hot water vapor from your kettle hits the colder air in the room. It would be correct to call this 'cloud' condensation, or one might call it an aerosol, but it is not vapor. Steam can simply mean water vapor, but engineers usually use the word steam to refer to water vapor that has been produced by boiling water, meaning that it is hot and under pressure. This is why we talk of steam engines, steam pumps, steam irons, etc. Steam that contains tiny droplets of liquid water is often referred to as 'wet steam'. Colloquially people sometimes use 'water vapor' to refer to the condensation, but this is scientifically incorrect. The current definitions given in the articles on water vapor and steam are not incorrect, though it would perhaps be helpful to provide clarification of the relationship between them. Dezaxa (talk) 14:12, 22 February 2021 (UTC)

The current situation is simply broken, as the article leads give substantially the same definition for both terms. The bodies of the articles differ in that water vapor focuses on natural gaseous water in the hydrosphere, whereas steam solely discusses artificial gaseous water and its applications. Is artificiality the real difference between the concepts?
Here are the relevant (equilibrium) systems of water and air (excluding solid water), together with some terms that in my understanding can describe them:
Liquid phase of aerosol contains Suspended in gas phase containing Names
water water, air "steam" (everyday usage), "mist", "fog"
none water, air "(moist) air", "humid air", air containing "water vapor"
water water "wet steam"
none water "superheated steam", "steam" (engineering usage), "water vapor", "dry steam"
Another term mentioned is "saturated steam", but the definition given in the article is nonsensical (all of these are equilibrium systems) so I'm not sure what it's supposed to mean. 73.223.72.104 (talk) 05:00, 18 January 2022 (UTC)

It seems that "water vapour" is a very clearly defined concept while "steam" has many definitions depending on context, but this is not sufficiently addressed in the article. All the Steam article needs is a short discussion near the start to disambiguate. As well as mentioning "wet steam", I think it should also mention that steam is a common term for water vapour that has been produced artificially by heating rather than pressure, and also that steam is a common term in engineering and industry. After reading through this talk page I think that's a far enough distinction, at least better than what we have currently in the article. Or if you disagree with this distinction, at least add something mentioning that "steam" (not "wet steam") is just a word for water vapour that is used in certain specific contexts. I think it would be useful for readers to know that "water vapour" is the more technically defined term while "steam" is more general. I'd like to make the changes myself, believe me, but I'm not experienced or confident enough to do a good job of it.

Also something to mention is that the second sentence starts "This may occur due to evaporation or due to boiling..." and yet the article on evaporation has no mention of steam and multiple mentions of water vapour, so I would also be tempted to remove "due to evaporation" from this sentence (if we are going down the steam is artificial water vapour route). Thoughts? Ambidextroid (talk) 19:08, 3 February 2022 (UTC)

Steam, Mist, and Water Vapor

If I understand correctly, steam is gaseous water and when it mixes with air, it's called water vapor. But the "steam" you see above a pot of boiling water is actually liquid water that has condensed when the steam/vapor hit the cooler air above the pot. IF this is correct... then this paragraph is a little misleading:

In common speech, steam most often refers to the white mist that condenses above boiling water as the hot vapor ("steam" in the first sense) mixes with the cooler air. After gaseous steam has intermixed with air, it is no longer properly called steam and is instead referred to as water vapor.

That makes it seem like the stuff you see is water vapor instead of condensed, liquid water.

  • You're right, and I fixed that. This page seems to have a lot of lying-to-children, but the topic has a both a complicated technical understanding, and a wide set of common ideas. There are a lot of common misconceptions about phases of matter and water. I've tried to fix up this page by putting the simple explanations first and the more complicated ones later. 32.97.110.142 22:34, 16 June 2006 (UTC)

I see that this issue has been brought up before with regard to both this page and the water vapor page, so I'm almost afraid to ask, but I can't help it, so here goes: what the hell is the difference between steam and water vapor? I've wondered this for years, and haven't found the answer here, even after reading both pages and a lot of the discussion on the talk pages. Unfortunately neither page even attempts to answer this oft-posed riddle. Xezlec 20:48, 6 August 2006 (UTC)

I think that below the critical point we talk of vapours (i.e. condensation may be brought about by the application of pressure without needing cooling as well), whereas above the critical point we talk of gases. So I'd refer to the invisible material close to a spout as steam or water vapour (but not gas), and to the white mist as 'condensed steam'. I regard 'steam' as a colloquialism rather than a scientific term. --80.189.133.60 (talk) 16:22, 21 August 2010 (UTC)

The difference between steam and water vapor is that water vapor is an invisible gas and steam is a visible mist of liquid droplets.  :-) — Omegatron 01:15, 26 October 2006 (UTC)
I believe your definition is incorrect Omegatron.
  • Steam is "odourless, invisible gas consisting of vaporized water. It is usually interspersed with minute droplets of water, which gives it a white, cloudy appearance." (Encyclopædia Britannica (EB) on steam). So steam in itself is invisible.
  • Water vapor is steam mixed with air or other gases (EB http://search.eb.com/eb/article-9074829)
  • What you see when you puff a small cloud from your mouth in cold weather is neither. It is tiny suspended water droplets, and depending on where they are found can be called fog or cloud. I am not aware of a good general term for water droplets suspended in air.
--Tunheim 15:35, 16 January 2007 (UTC)
I realized my above statement was somewhat blunt and categorical. It wasn't meant that way :P (long day...) --Tunheim 15:44, 16 January 2007 (UTC)

It is tiny suspended water droplets, and depending on where they are found can be called fog or cloud. I am not aware of a good general term for water droplets suspended in air.

I think the word you're looking for is "steam". Definition: "A mist of cooling water vapor."  :-) — Omegatron 16:11, 16 January 2007 (UTC)
My impression is that steam is 100% water while a puff of breath is mainly nitrogen and such does not qualify as steam. Do you have a reference for your definition? --Tunheim 10:57, 8 February 2007 (UTC)

Discussion continued in the "Article split" section. Nurg 04:31, 24 February 2007 (UTC)

Water vapour is gaseous water. Like other colourless gases, it is invisible at normal pressures. Steam is a mixture of water vapour, liquid water droplets, and ambient gases. Grassynoel (talk) 02:09, 28 February 2022 (UTC)

Article split into "steam" and "water vapor"

No reason for the split suggestion was given so I removed it. --Tunheim 15:42, 16 January 2007 (UTC)

The reason given was "the stuff about water vapor doesn't belong here; it already has an article. this article is about the condensed mist". — Omegatron 16:09, 16 January 2007 (UTC)
Sorry, I didn't see that one. I thought it was common to provide the rationale of a clean up template at the discussion page that the template in use points to. But I'm rather new to Wikipedia. Could you enlighten me on this? --Tunheim 10:51, 8 February 2007 (UTC)

I agree this should not be split. That would just make 2 stubs. Prep111 15:21, 9 February 2007 (UTC)

The word "steam" has at least 2 meanings. I'm not a physicist or chemist but it seems to me they are:
  1. H2O as a gas, ie, the molecules are independent. The gas is invisible. This seems to be the scientific and technical use of "steam". Synonymous with "water vapour" and "dry steam".
  2. H2O as hot droplets of liquid suspended in air and visible. Invisible gas molecules of H2O will also be present. This is the common or popular use. Similar to "wet steam". (Seems to me the difference between wet steam and clouds/fog/mist is just temperature.)
Maybe the answer is:
  1. Move info about the gas from the steam article to water vapor.
  2. Make steam into an article about the hot suspended liquid and rename it wet steam.
  3. Create a disamb page called steam.
I am not expert in the subject so maybe there is a better arrangement.
OED has for steam: "6. a. The vapour into which water is converted when heated. In popular language, applied to the visible vapour which floats in the air in the form of a white cloud or mist, and which consists of minute globules or vesicles of liquid water suspended in a mixture of gaseous water and air. (Also sometimes applied to the vapour arising from other liquids when heated.) In modern scientific and technical language, applied only to water in the form of an invisible gas. The invisible ‘steam’, in the modern scientific sense, is, when its temperature is lowered, converted into the white vapour called ‘steam’ in popular language, and this under continued cooling, becomes ‘water’ in the liquid form. dry steam, in Steam-engine working, steam containing no suspended vesicles of water: opposed to wet steam." Nurg 04:31, 24 February 2007 (UTC)
I've never heard the term "wet steam", but it sounds like a pretty good proposal. — Omegatron 06:17, 24 February 2007 (UTC)
Referring to the suggested course of action above:
  1. 'Move info about the gas...' Support and provide a clearer top-of-page link to water vapour
  2. 'Make steam ..article about hot suspended liquid...' support
    '...and rename as wet steam' strong oppose – the fact that 100s of pages link to this one is a consideration, but more important is the general WP principle that pages should have the name most commonly identified with the subject. I can imagine many people searching for 'steam', but very few for 'wet steam'.
  3. Create a DAB page oppose. Steam (disambiguation) already exists, making 'steam' a DAB page too seems rather unnecessary.
Steam should include something about 'what steam is' but also cover the practical uses of steam and how it occurs in nature. Water vapour can cover the scientific aspects of the gas. Curiously, this is pretty much the case already. (I checked the two articles AFTER I wrote that, so maybe not much needs to be done after all... :o) )
EdJogg 10:10, 24 February 2007 (UTC)
Nurg, the definition you provided from the Oxford English Dictionary (OED) was very enlightening and makes much sense. However, this doesn't fully clarify the situation of steam vs. water vapor. Would you, or someone else with access to the OED, be able to post the definition of water vapor? --Tunheim 12:10, 28 February 2007 (UTC)
OED: "water-vapour, the invisible aqueous vapour present in the atmosphere" Nurg 03:14, 24 March 2007 (UTC)

Yeah. I agree with EdJogg. A disambig link at the top of the Steam article is sufficient. It is the term most commonly associated with the suspended droplets. — Omegatron 19:29, 28 February 2007 (UTC)

'Wet Steam' seems to be causing some confusion. It is a mixture of the liquid and gaseous phases of H2O (necessarily at boiling point). 'Dry Saturated' steam is pure gaseous phase H2O at boiling point, and as such is more of a theoretical concept than something it is easy to make, as steam is likely either to contain some liquid on the one hand or to be superheated on the other, and dry saturated steam exists only on the infinitesimal boundary between the two. For example, a steam engine is described as either 'superheated' or a 'wet steamer'. Bill F 23:07, 28 March 2007 (UTC)

Just want to point out (sorry to belabor the point) that currently, the first paragraph in the steam article states "steam refers to vaporized water. It is a pure, completely invisible gas (for mist see below).", and the words "vaporized water" are a link to the "water vapor" page. The water vapor page then states "Water vapor, also aqueous vapor, is the gas phase of water." This suggests that the two concepts are precisely identical. Can everyone agree that this is incorrect? Xezlec 03:26, 9 April 2007 (UTC)

I am a physicist, and I have to wonder what the hell is wrong with you people. Steam and water vapor are completely distinct. There is no overlap, at all, ever. "Wet steam" is a tautology on the order of "sugary glucose". I have to question the motives and ethical outlook of a group of people who are willing to redefine words in the English language to obfuscate the difference between two different phases of matter. When you have a kettle on the stove, and you can see steam shooting out of it, that's liquid. The water vapor is invisible to the naked eye. --75.49.222.55 03:48, 9 October 2007 (UTC)

I fail to see what what this discussion has to do with motives and ethical outlook although I have to wonder what the hell is wrong with a Texan physicist who hasn't the courtesy to sign in. Anyway to my knowledge, "wet steam" in common usage is synonymous with saturated steam. --John of Paris 21:35, 9 October 2007 (UTC)

Sheesh there, physicist- no need to get so touchy. Can't you see that while what you are saying is correct, the word "steam" has more than one meaning and usage? That is the essence of the entire controversy. I myself have to question the ethics of someone who shows up to a discussion like this and speaks down to people who, whether he likes it or not, are his peers.

Anyway, I edit and write science books for kids. We use the term water vapor to mean the gaseous form of H2O (the SLG forms being ice, liquid water, water vapor) Since I communicate with children, I explain that the steam they see coming out of the kettle is actually when some of the water vapor condenses in the air and forms tiny droplets. I point out that right at the base of the kettle you dont "see" steam, and that is the water vapor right there. I have to point out however that I have engineer friends who tell me how all elementary and secondary educational publishing is incorrect on this. They "are" physicists as well, and they have a different view of this because of steam tables and the like. TheMetalChick (talk) 15:57, 29 January 2009 (UTC)

I have also always been taught that water vapour is the gas formed when water is heated, and that steam is a suspension of liquid water droplets in air. These definitions were introduced to me at the age of 11 when I started high school, and perpetuated through GCSEs, A-levels, and four years of an engineering degree - but, only in verbal use. The reference tables engineers use in calculating energy transfers made using heated water are called "steam tables", and in this context steam clearly refers to what we were always taught was "water vapour" at least part of the time. There is an ambiguity in this which should be discussed, but my view is that the definitions we were given in school were probably given so consistently in an effort to remove this ambiguity from the terminology.

Having looked at the OED entry for "steam", I would suggest that their definition, being apparently written by non-scientists, and citing no references in the last hundred years or so, might not be as accurate or reflective of the newer attempt in current education to draw a division between "steam" and "water vapour" as it perhaps could be? Perhaps though, the easiest solution from an engineering perspective would be to rename the steam tables and call them "heated water tables" or similar, since they actually refer to water in a variety of states. Redcore4 (talk) 11:36, 19 February 2009 (UTC)

  • I hope this doesn't cause more confusion but discussion on Water vapor ("Scientific Discrepancies, Confounding factors and limits of knowledge" section) may indicate that this definition problem is known, and conveniently ignored / side-stepped by many others. A subsection of the Water Vapor article has been completely removed without explanation, the section included the phrase "this remains a particularly tricky and sometimes controversial factor in many fields of science". A lack of citation has been suggested as justification for the non-inclusion. But, surely, citation would be impossible (a bit like trying to prove a negative), if in fact the problem is regularly side-stepped, or put it another way worked around, as long as the results or outcome are good enough, nobody gets concerned, and nobody gets hurt. Except, that is, those trying to understand the subject, those who haven't been told about the work-arounds and fudges and approximations 79.76.157.17 (talk) 19:22, 20 February 2009 (UTC)

Distinction btw "Steam" & "Water vapor" articles is not clear

Would someone be kind enough to explain to me why this is a separate article from water vapor? I understand that "water vapor," i.e. invisible H20 gas, is different from what we know colloquially as "steam," i.e. microscopic liquid droplets of H20 that have accumulated into a white mist that resembles a gas but actually is a liquid. But this article is very confusing. The lede seems to say that steam is water vapor. Perhaps, they are technically the same. But if there are to be two articles, then this one must be about the gas, and the other must be about the accumulation of tiny liquid droplets that resembles gas but actually isn't.

And, if I'm right in this distinction, then it must be made clear in this article's lede. The lede must say something like: "Steam is technically water vapor, but, colloquially, it's actually accumulated droplets of liquid water that form a visible gaseous-looking substance. This article is about the latter, colloquial meaning of 'steam.'" Something like this must be written in the beginning of the introduction to make the distinction between these two articles clear. Cause, as it stands, readers are going to have no clue why articles on gas-form water are split up. I certainly don't understand why -- after all, the intro flat out says "steam is water vapor."

Also, if there are to be two articles, this one must avoid overlapping with the other. In other words, the "steam" article should not talk about steam as water vapor at all, anywhere (reasonably speaking). That's for the "water vapor" article, not this one. Sure, as aforementioned, the intro should state that steam is technically vapor, but that statement should amount to one clause or sentence in that paragraph. And it should make clear that the content of this article isn't at all about steam as water vapor.

I don't know if I'm getting this right. I know I'm coming to this discussion very late, and, therefore, I'm not totally up to speed. So please do inform me of why these three articles have been split up. Thanks. Cheers, ask123 (talk) 04:32, 7 August 2009 (UTC)

I was re-reading the article and noticed that it refers to steam as "invisible." First of all, I don't believe that the word "invisible" is one that is scientifically valid. Something can be "transparent" or "not visible to the naked eye," but that's not the same as being "invisible." Second, and more to the point, the distinction I was thinking of above clearly doesn't apply. Now it seems to me that this article is about "water vapor," and, therefore, I don't see why these articles shouldn't be merged. ask123 (talk) 04:39, 7 August 2009 (UTC)

For me this issue still rings true today, 13 years later. The opening paragraphs of the two articles seem near identical. If one is a subcategory of the other, this could be made a good deal clearer. (I don't consider myself competent to make the changes.) Wootery (talk) 20:27, 28 May 2022 (UTC)

Water at STP?

"Water increases in volume by 1,700 times at standard temperature and pressure;..." What?

It is understood that boiling water produces water vapor, but this state for water is not at standard temperature or pressure. This bit needs to be re-written for accuracy, or possibly just for clarity. Indyola (talk) 04:53, 3 July 2023 (UTC)

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