!!link!!: Refprop 9.1

It supports 121 pure fluids and 5 pseudo-pure fluids (like air), allowing for mixtures with up to 20 components .

is more than just software; it is a touchstone of engineering rigor. By integrating the most accurate equations of state into a robust, callable library, NIST empowered a generation of engineers to move beyond approximations and design systems that truly push the limits of thermodynamic efficiency. Whether you are a graduate student simulating a supercritical CO2 power cycle, a refrigeration technician analyzing a cascade system, or a process engineer designing an LNG plant, REFPROP 9.1 offers the reliability and accuracy you demand. refprop 9.1

A common question is: Why not just use the newest version? It supports 121 pure fluids and 5 pseudo-pure