When gas is compressed, what happens to its temperature?

When gas is compressed, its temperature increases due to the principles of thermodynamics, specifically the ideal gas law. When a gas is compressed, the molecules are forced closer together, resulting in an increase in their kinetic energy. The temperature of a gas is directly related to the average kinetic energy of its molecules; when the kinetic energy increases, the temperature rises.

This phenomenon can also be understood in the context of Boyle's Law, which states that the pressure of a gas decreases as its volume increases (and vice versa), provided the temperature remains constant. However, when you compress the gas (reducing its volume), not only does the pressure increase, but energy is also inputted into the system, which raises the temperature of the gas. This relationship is essential in processes such as gas compression in engines and refrigeration systems, where the heat generated from compression needs to be managed effectively.