Perfect gas at constant pressure

Referring back to Fig. 16, we assume that the fraction of space between the globs just above the melting point is AF/F, and this is the volume available for perfect gas atoms. However, since the thickness of the inter-globular shell is assumed to maintain a constant value r, then the space is a two-dimensional gas. Since the bulk coefficient of expansion of a perfect gas at constant pressure is IjT, that of a two-dimensional gas is fT. So the bulk coefficient of thermal expansion of a liquid just above the melting point should be obtained by prorating the expansions due to the solid fraction 1 — AF/F and the gaseous fraction AF/F ... 

For a perfect gas at constant pressure, P = const., Eq 2.1 gives the relationship between the heat capacity at constant pressure and constant volume, viz. Cp - = R (R is the gas constant). Similarly,... 

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