Critical variables are defined, for example in Thermodynamics (Greek: thermos = heat and dynamic = change) is the physics of energy, heat, work, entropy and the spontaneity of processes. Thermodynamics is closely related to statistical mechanics from which many thermodynamic relationships can be derived. While dealing with processes in which systems exchange matter or energy, classical thermodynamics is not... thermodynamics, in terms of the values of variables at the Chemistry In chemistry, a critical point is the conditions ( temperature, pressure) at which the liquid state of the matter ceases to exist. As a liquid is heated, its density decreases while the density of the vapor being formed increases. The liquid and vapor densities become closer and closer to each... critical point.

On a PV diagram, the critical point is an In mathematics, particularly in calculus, a stationary point is a point on the graph of a function where the tangent to the graph is parallel to the x-axis or, equivalently, where the derivative of the function equals zero (known as a critical number). An inflection point is a point... inflection point. Thus:

For the The title given to this article is incorrect due to technical limitations. The correct title is van der Waals equation. The van der Waals equation is an equation of state for a fluid composed of particles that have a non-zero size and a pairwise attractive inter-particle force (such... van der Waals equation, the above yields:

v_C = 3b