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Phase Changing


Compxpert
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All that happens is you have a liquid that expands and changes to a gas as it comes out of a metering device. As it expands it changes from a liquid to a gas and there is where the cooling effect comes from. As an example if you pour rubbing alcohol on your hand and blow on it you will notice that as it evaporates it cools your hand. Hope this helps. :foldon:

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I think of it as a can of say deodorant. When the liquid inside is compressed its hot, but when its released into a gas very quickly it gets very cold. The same thing goes for CO2 fire extinguishers, if you touch it when it comes out, its freezing.

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