“Now you know what an aerosol is, you can see what an aerosol can is all about: it's a mechanism designed to turn a liquid, such as paint or polish, into a finely dispersed mist. So how does it work?
If you've ever read the back of an aerosol can, you'll have noticed messages such as "pressurized container" and "contents stored under pressure." What's that all about? To ensure that something like paint comes out evenly when you press the button on the top of an aerosol can, the manufacturers have to squeeze the contents inside with a pump or compressor (a bit like inflating a bicycle tire). Typically, the contents of an aerosol are stored at 2–8 times normal atmospheric pressure. That's why aerosols really rush out when you press their buttons.
It's also why aerosols feel really cold when you spray them on your body. If you let a gas escape from 8 times its normal pressure into the air, it expands enormously and cools down drastically. Gases cool when you let them expand because the heat energy their atoms or molecules contain is spread over a much bigger volume. Imagine a gas at a particular temperature: it has a certain amount of heat locked inside it. Now spread that gas over a volume 8 times bigger. There's the same amount of heat divided over a much bigger space, so each part of the space contains much less heat than before—it's cooler, in other words.”
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