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Originally Posted by Amano
WHAT??? Why would you convert mass into energy with a simple phase change? I'd really like to see your calculations.
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I calculated how much energy it would take to turn a 10 m cube of ice into water vapour. Somewhere around 700 calories/gram.
I then divided by c^2, and got the mass of that energy. Remember, all energy has mass.
Thus, if you take a block of ice, and turn it into water vapour, the resulting water vapour will mass more (and hence be heavier) than the original block of ice, but only by a very small amount.