User talk:Gcllau

Welcome to Wikipedia - some useful links for you

Hello, Gcllau! Welcome to Wikipedia! Thank you for your contributions to this free encyclopedia. If you decide that you need help, check out Getting Help below, ask me on my talk page, or place {{helpme}} on your talk page and ask your question there. Please remember to sign your name on talk pages by clicking or using four tildes (~~~~); this will automatically produce your username and the date. Finally, please do your best to always fill in the edit summary field. Below are some useful links to facilitate your involvement. Happy editing! DuncanHill (talk) 06:00, 13 January 2008 (UTC) Getting started A tutorial • Our five pillars • Getting mentored How to: edit a page • upload and use images Getting help Frequently asked questions • Tips Where to ask questions or make comments Request administrator attention Policies and guidelines Neutral point of view • No original research Verifiability • Reliable sources • Citing sources What Wikipedia is not • Biographies of living persons Manual of Style • Three-revert rule • Sock puppetry Copyrights • Policy for non-free content • Image use policy External links • Spam • Vandalism Deletion policy • Conflict of interest • Notability The community Build consensus • Resolve disputes Assume good faith • Civility • Etiquette No personal attacks • No legal threats Community Portal • Village pump Signpost • IRC channels • Mailing lists Writing articles Be bold in editing • Develop an article The perfect article • Manual of style Stubs • Categories • Disambiguation Pages needing attention • Peer review Miscellaneous User name • User pages • Talk pages Clean up: General - Spam - Vandalism Join a WikiProject • Translation Useful templates • Tools • User scripts

Signing

Please don't sign articles (i.e., don't place ~~~~ in the article body). Each page's revision history documents who added what. Signing is useful for talk pages, because there, it's important to see who said what as part of the content, not just for historical or copyright purposes. DMacks (talk) 14:43, 9 April 2008 (UTC)

Wikipedia pages

I have deleted a page you created, Gram per cubic centimetre, because it had no viable content. Remember, every page has to be a factual description of a clearly-defined topic, not merely editorial comments or reminders to others. Density can be expressed in any "mass per volume" unit. If you have concerns about the specific units used in a specific article, please discuss it on that article's talk page. DMacks (talk) 14:55, 9 April 2008 (UTC)

Sorry that I have signed on the page Yes, it is true that the Density can be expressed in any "mass per volume" unit, but the Kg per cubic metre is wrong and misleading to the readers. The density of 50 Kg per 2 cubic meter is not 25, but 0.025 Gcllau (talk) 04:00, 10 April 2008 (UTC)

Density isn't a unitless quantity: 50 kg per 2 cubic meter is "25 kg/m³" or "0.025 kg/dm³". Specific gravity is a unitless relative density, but because it's a ratio, it doesn't matter what units were used to measure the numerator and denominator as long as they are the same. That last bit is the only place having a well-defined standard unit matters--need to match whatever is used for the reference value. DMacks (talk) 04:38, 10 April 2008 (UTC)

Thank you Gcllau (talk) 04:57, 10 April 2008 (UTC)