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Overview

Critical variable

Critical variables are defined, for example in thermodynamics, in terms of the values of variables at the critical point.

On a PV diagram, the critical point is an inflection point. Thus:

$\left(\frac{\partial P}{\partial V}\right)_{C}=0$

$\left(\frac{\partial^2 P}{\partial V^2}\right)_{C}=0$

For the van der Waals equation, the above yields:

$P_C=\frac{a}{27b^2}$

$\displaystyle{V_C=3Nb}$

$T_C=\frac{8a}{27bR}$

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Critical_variable". A list of authors is available in Wikipedia.

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