Nist Refprop 9 ((free)) -

It calculates a vast range of data, including: Thermodynamic: Density, enthalpy, entropy, heat capacity ( ), speed of sound, and vapor pressure. Transport: Viscosity and thermal conductivity.

The software is built on several high-accuracy mathematical models to ensure reliability:

Used for complex mixture calculations to account for departures from ideal mixing. Engineering and Research Applications nist refprop 9

Version 9.0 introduced updated equations of state for fluids like cyclopentane, R-1234yf, and R-1234ze(E), and expanded the number of binary mixtures with interaction parameters from 303 to 639. Technical Architecture

Employed for fluids with limited experimental data. It calculates a vast range of data, including:

Used for specific international standard equations, such as R-123.

Version 9.0 includes 105 pure fluids , 5 pseudo-pure fluids (like air), and supports mixtures with up to 20 components . Engineering and Research Applications Version 9

Calculations for vapor-liquid (VLE), liquid-liquid, and solid-liquid systems.