How is Charles' law different from Gay-Lussac's law?

Charles's law talks about the relationship between volume and temperature (high temperature = high volume, and vice-versa) while Gay-Lussac's law talks about the relationship between pressure and temperature (high temperature = high pressure, and vice-versa).

In fantastic equation form:

Charles's law: ##V_1/T_1 = V_2/T_2##

Gay-Lussac's law: ##P_1/T_1 = P_2/T_2##

Where P, V, and T refer to pressure, volume, and the temperature of the gas in Kelvin.

OK.