Its two parameters account for particle size and nonzero interparticle interaction strength and are typically written as a and b.
S  SCIENCE  Its isotherms obey an equal-area rule named for Maxwell, and like the Tait equation, a modified form of it is often used as a PVT equation for compressible fluids. One of its principle failings comes at gas-liquid equilibria, since it does not predict that at constant temperature, pressure is constant as volume varies; however, a law that improves on it further, the Redlich-Kwong equation, does even worse with vapor-liquid equilibria. Its two parameters account for particle size and nonzero interparticle interaction strength and are typically written as a and b. It shares a namesake with the forces arising from particles developing instantaneous dipoles, also known as London dispersion forces. For 10 points, identify this equation of state, an improvement on and generalization of the ideal gas law.
S  SCIENCE  Its isotherms obey an equal-area rule named for Maxwell, and like the Tait equation, a modified form of it is often used as a PVT equation for compressible fluids.
{van der Waals} equation