The GUI in v9 is with separate windows for:
Unlike many academic calculators, REFPROP 9 was designed for integration. It includes: nist refprop 9
: Capable of calculating vapor-liquid, liquid-liquid, and solid-liquid systems. The GUI in v9 is with separate windows
Thermodynamics tells you the state of the fluid (Pressure, Volume, Temperature), but "Transport Properties" tell you how the fluid moves. REFPROP 9 provides highly accurate data for: and supercritical phases.
NIST REFPROP 9 provides a comprehensive suite of tools for thermophysical property prediction across a wide range of fluid conditions, including liquid, gas, and supercritical phases.