Gay-Lussac’s law, or the pressure law, was found by Joseph Louis Gay-Lussac in 1809. It states that, for a given mass and constant volume of an ideal gas, the pressure exerted on the sides of its container is proportional to its temperature.
As a mathematical equation, Gay-Lussac’s law is written as either:
P/T=k3
P1/T1=P2/T2
where P is the pressure (Pa), T is the temperature (measured in Kelvin), and k3 (is the constant from this equation—it is not the same as the constants from the other equations above.
I used the second form, as there aren’t reliable figures for how the ball may stretch when wet. For that form, with a unchanging number of moles of the gas, there is no need for a constant.