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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, Na = 6.02217 · 1023 molecules/mole, Runiv = 8.314 · 107 erg/K/mole, k = Runiv/Na = 1.380622 · 10-16 erg/K
P = (N/V) k T = (rho · Na/<mw>) k T
Rg ident Runiv/<mw> erg/K/gm
P = rho · (Runiv/<mw>) · T = rho Rg T