First of all, Charles' Gas Law indicates that the volume that
an amount of gas occupies will increase if you increase the temperature of the
gas molecules. Note that when you increase the temperature of the gas
molecules, it means that the molecules are moving faster and thus, the kinetic
energy stored in the molecules also increase. This is what the Kinetic
Molecular Theory of Gases also says. Moreover, since the molecules are moving
faster, there is a higher probability of collision with other molecules. So, in
order to keep the pressure inside the vessel the same throughout the process,
the volume or the space occupied by the gas molecules must also be increased. Thereby,
the assumption that explains Charles' Law is <span>4. Increase in
temperature increases the kinetic energy of the molecules. </span>
