Deviations from this equation can be found by plotting the compressibility factor against pressure; the virial expansion is often used to measure those deviations. The Peng-Robinson equation is a good alternative to this equation at low pressures and the Redlich-Kwong equation is a better alternative at high pressures. A more common alternative is an equation that introduces parameters (*) a and b, the van der Waals equation. For 10 points, name this equation of state describing the behavior of 
Deviations from this equation can be found by plotting the compressibility factor against pressure; the virial expansion is often used to measure those deviations. The Peng-Robinson equation is a good alternative to this equation at low pressures and the Redlich-Kwong equation is a better alternative at high pressures. A more common alternative is an equation that introduces parameters (*) a and b, the van der Waals equation. For 10 points, name this equation of state describing the behavior of a sufficiently dilute gas, which states that PV equals nRT.
Deviations from this equation can be found by plotting the compressibility factor against pressure; the virial expansion is often used to measure those deviations.