eli5: Why does air-in-a-can get cold when you use it?
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The air in a can dusters are not actual compressed air. Rather they are a liquid that evaporates very easily. To prevent that we squeeze it super tightly into the can. In order for something to boil it takes energy. In this case the energy comes from the relatively warm can. Once you open the valve and release the pressure the liquid will absorb that energy, boil, and release gas. However, once the can cools the boiling will stop because theres not enough energy to continue boiling the liquid. This is why if you keep the nozzle depressed it will slow to a stop until you let it sit and warm up again.
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