Compressibility Factor Calculator (exact)

This is a compressibility factor calculating algorithm using Kapuno's algorithm.

Calculates compressibility factor (Z) of gas at a given temperature and pressure. Calculated by Van der Waals equation of state, using the algorithm given in Programming for Chemical Engineers Using C, C++, and MATLAB® By R. Kapuno
Example: Find the compressibility factor of methane at 280 K and 20 bar:
Z = compressibility2('methane',280,'K',20,'bar')
Z = 0.951140928234726

The above example shows that methane at 280 K and 20 bar deviates from the ideal gas law by approximately 4.9%.