French chemist, Joseph Gay-Lussac is most famous for his description of the gas law, Gay-Lussac's Law.

Explain Gay-Lussac's law using words to describe the relationship between the variables. What are the assumed constants in Gay-Lussac's law?

The pressure of a fixed amount of gas at fixed volume is directly proportional to its temperature in kelvins.

P is the pressure of the gas.
T is the temperature of the gas (measured in kelvins).
k is a constant.

http://en.wikipedia.org/wiki/Gay-Lussac