system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the can of compressed-air dust remover gets so cold if used continually at once?
gpt
So, when you're dealing with gases, you have to understand that, in order to expand, a gas must heat up.

When you use compressed air duster, there's more room in the can that the gas then has to occupy. In order to do that, it has to absorb heat from its surroundings; in this case, the can, which we sense as the can cooling down.