Ideal Gas Law

P · V = N · k · T = n · R · T

where N is the total number of molecules, n is the total number of moles, N_a = 6.02217 · 10²³ molecules/mole,

R_univ = 8.314 · 10⁷ erg/K/mole, k = R_univ/N_a = 1.380622 · 10^-16 erg/K

P = (N/V) k T = ( rho

rho

· N_a/<mw>) k T

R_g

ident

R_univ/<mw> erg/K/gm

P =

rho

· (R_univ/<mw>) · T = rho

rho

R_g T