Upon completion of this module, you should be able to understand the relationships between pressure (P), volume (V), temperature (T), and the number of moles of gas (n) using gas laws. Charles's Law involves changes in the temperature and the volume of a gas and is represented by the relationship V1/T1 = V2/T2 where V1 is the initial volume of the gas, T1 is the initial temperature in Kelvins, V2 is the final volume, and T2 the final temperature in Kelvins.