Ideal Gas - P,v,T surface plots

Standard temperature and pressure:  1 kilomole of ideal gas at 1 atmosphere pressure (=1.01*(10^5)Pa) occupies 22.4 (m^3).  In what follows, we’ll plot pressure in Pascals/R:  1 atmosphere=12.14 kilomoles K / (m^3).  v is in (m^3)/kilomole, and temperature in degrees K.  Then standard temperature and pressure corresponds to

({{({{(P,v,T)=(12.14,22.4, 273)}})}})

ParametricPlot3D[{v,P,P*v},
{v,0,30},{P,0,15},
BoxRatios->{1, 1, 1},AxesLabel->{"v","P/R","T"}]

Isotherms - constant Temperature

Manipulate[
ParametricPlot3D[{{v,P,P*v},{v,P,T}},
{v,0,30},{P,0,30},
BoxRatios->{1, 1, 1},AxesLabel->{"v","P/R","T"}],
{T,20,250}
]