Refprop -

REFPROP, NIST, Thermodynamics, Equation of State, Helmholtz Energy, Fluid Properties.

REFPROP does not rely on simple ideal gas assumptions. Instead, it utilizes high-precision mathematical formulations derived directly from empirical experimental data. refprop

In the realms of chemical engineering, mechanical engineering, and thermodynamics, the accurate prediction of fluid properties is not merely an academic exercise—it is the bedrock of reliable process design, energy efficiency, and safety analysis. Whether designing a power plant, a refrigeration cycle, or a natural gas pipeline, engineers must know how a fluid will behave under varying temperatures and pressures. Enter REFPROP (Reference Fluid Thermodynamic and Transport Properties), a software program developed by the National Institute of Standards and Technology (NIST). Over the past three decades, REFPROP has evolved from a niche academic tool into the global gold standard for calculating the thermophysical properties of pure fluids and their mixtures. Over the past three decades, REFPROP has evolved