The duster can I use always gets really cold whenever I use it for long enough. Can someone explain in the simplest way possible the reason why it gets cold?
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When you squeeze a wet sponge, it leaks a bunch of water so it feels very wet, but you just squeezed a bunch of water out so it is holding less water, despite feeling more wet.
When you release a clenched sponge, it feels very dry because it now has a bunch of space for more water and thus absorbs moisture from its surroundings.
Gases do the same thing with heat under pressure. When you squeeze a gas, it releases a bunch of heat and when you decompress gas, it has more room for heat and absorbs a bunch from its surroundings.
The important observation here is that how hot a gas feels is actually not related to how much heat it is holding, but rather how much heat is leaking out of it.
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