Why does spray deodorant come out of the can so cold, even though it is kept at room temperature?

Question

Why does spray deodorant come out of the can so cold, even though it is kept at room temperature?

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Answer 1

Worth noting the gas in your canister isn’t necessarily just expanding, it may also be evaporating. The pressure in the bottle holds it in liquid form at room temp, and a reduction of pressure as it exits causes the liquid to vaporise.

This furthers the cooling effect as vaporisation is highly endothermic (absorbs a bunch of heat).

Your AC unit works on the same principle – by releasing compressed liquid into a very cold gas, using it to cool the room then compressing it back into a liquid (the liquid will be hotter than at the start). The compressor is the noisy and power hungry bit in your AC.