Charles law is also known as the law of volumes. It is basically the property of an ideal gas and describes its properties when it is heated. The law states that the volume of a sample of dry gas is directly proportional to the temperature if the pressure is held constant. This shows that any ideal gas is likely to expand as the temperature of the gas increases.
Conversely, a decrease in temperature will result in the gas shrinking. It is named after its founder Jacques Charles who formulized the law in the 1780s. However, it was Dalton who showed that this law applied to all ideal gasses as well as vapors of volatile liquids.