van der Waal's P-V diagram (using numerical methods)

This code calculates the critical temperature and phase transformation pressure for a given temperature using van der Waal's EoS.

Van der Waal's equation of state is one of the most well-known real equations of state. This script numerically calculates the points of inflection of the P-V isotherms and then finds the critical temperature of a given substance (i.e. when the points of inflection coincide).
Also, it calculates the pressure at which the phase transformation will occur, i.e. when the area enclosed by P-V isotherm and that constant pressure line above and below the constant P line is the same. This code is based on numerical methods so it may not give results in the shortest possible time.
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