system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5, why does compressed air get colder as you use it?
gpt
> why does compressed air get colder as you use it?

Probably what you are familiar with is "canned air" such as in computer cleaners. They aren't really compressed air but rather a chemical with a low boiling point and low vapor pressure. This allows them to pack a high volume of gas into a container without it needing to be exceedingly strong.

When you release some of the gas out of the container the liquid within will start to boil in order to restore the vapor pressure within the container. The change in state from liquid to gas requires energy which is absorbed in the form of heat, cooling the walls of the container.