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Like a reverse microwave. Set it to cool a warm soda or bottle of wine or flash freeze leftovers. Small as a microwave, but shaped like a microwave on end so it can fit bottles.
BigOldGeek, Oct 30 2003
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Heard of this before. How about an ampule full of compressed nitrogen or CO2? Also, Some salts are endothermic when they get wet- only one I can remeber is NH4NO3, which is a fire hazard but was once used in "instant ice packs".
If you can make a "reverse microwave" I'm sure it would make you rich. The problem is, there is no known way to make such a thing, so this idea is useless.
I have thought of this idea as well, and thought of a possible way. It is waves causing the molecules in the 'food' to become excited. Could it be possible to generate two waves 180 degrees out of phase with each other, and thus 'de-excite' the molecules? A semi-similiar method is used in noise reduction headphones.