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Old 10-05-2009, 05:54 PM
_xiao_wenti_ is offline
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Join Date: May 2002
Location: SE USA
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Cp[water, liquid]((T, room in kelvin)-(T, ice in kelvin)) will give you the number of joules needed. Joules are a measure of energy, watts are a measure of power (1 joule per second).

4.186J/gramC*(21C-0C), so ~88J per gram water

You really can't use a time-embedded unit very easily, heat transfer, kinetics, etc will confound it all.