What happens to the volume of an ideal gas as temperature drops

Based on the ideal gas equation, the pressure (P), volume (V) and temperature (T) corresponding to n moles of an ideal gas are related as:

PV = nRT

where R = gas constant

Under conditions of constant pressure and number of moles:

The volume is directly proportional to the pressure. Therefore, as the temperature drops the volume will also decrease.

V α T

This is also known as the Charles Law.