(REference Fluid PROPerties) is a program developed by the National Institute of Standards and Technology (NIST) . It calculates the thermodynamic and transport properties of pure fluids and fluid mixtures.

REFPROP 9 is frequently integrated into broader engineering software environments for complex modeling: Answers to Frequently Asked Questions - NIST Pages

: Analyzing wicking performance and liquid propagation in complex structures.

He hit "Calculate."