Critical Variables
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Critical variables are defined, for example in
thermodynamics Thermodynamics is a branch of physics that deals with heat, Work (thermodynamics), work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed b ...
, in terms of the values of variables at the critical point. On a PV diagram, the critical point is an
inflection point In differential calculus and differential geometry, an inflection point, point of inflection, flex, or inflection (rarely inflexion) is a point on a smooth plane curve at which the curvature changes sign. In particular, in the case of the graph ...
. Thus: : \left(\frac\right)_=0 : \left(\frac\right)_=0 For the
van der Waals equation The van der Waals equation is a mathematical formula that describes the behavior of real gases. It is an equation of state that relates the pressure, volume, Avogadro's law, number of molecules, and temperature in a fluid. The equation modifies ...
, the above yields: : P_C=\frac : \displaystyle : T_C=\frac


References

{{DEFAULTSORT:Critical Variable Thermodynamic properties Conformal field theory