User talk:Wjbentley

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Theological systems

Create an article on theological systems... refer to Good article Wjbentley 04:44, 14 November 2005 (UTC)[reply]

Reply to your question on talk:calcium page[edit]

Calcium as an alternative fuel? Calcium certainly has a lot of power density, but it's relatively unsafe to handle - its reaction with water, though gentler than sodium or potassium, it's still very strong, exothermic, giving a self-accelerating reaction (i.e. moist paper or clothing + calcium will react producing hydrogen, heat up in the process, the temperature accelerating the reaction, heat up even more, and so on, until you get a fire with hydrogen combustion in the process and caustic molten calcium metal and lime spurting all over the place.) Also, it's not stable in storage. A much better suited material would be magnesium, that's cheaper to produce, stable in storage, will not react with water except a little bit with boiling water. Magnesium is still very dangerous, because its metal shavings can ignite from even static, and start a very dangerous fire, that's impossible to extinguish with water or most fire extinquishers, except with a sudden, large amount of dry sand. Still, magnesium is safer than gasoline as far as flammability goes, has very high power density, its main competition being aluminum and zinc. Zinc has too high an atomic number for power density, but it's the safest to handle, and easiest to manufacture (low boiling pt.) Aluminium should theoretically be more expensive than magnesium, because anhydrous aluminum chloride is hard to make (it will not release the water, but turn into infusible aluminum oxide and hydrogen chloride instead), while anhydrous magnesium chloride is easy (it dehydrates fine.) Still, state of the art aluminum factories do like 14 MWh/ton aluminum, (theoretical I'd have to hunt down), while current magnesium production processes can only do 35-40 MWh/ton compared to 7 MWh/ton theoretical. Please look at the Pidgeon Process article.

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02:24, 29 October 2005 (UTC)