Ideal Gas Law
P*V = N*k*T . We further define R = Na*k, where Na = 6.02 x 1023 = 1 mole. Thus we have: P*V = n*R*T .
n = N/Na = number of moles in volume, V;
T must be in Kelvin, Not oF or oC !
k = experimental constant = 1.38 x 10-23 J/K ;
R = Na*k = 8.3 Joules/mole*Kelvin .