|link|: Nist Refprop 9

: Implements high-accuracy Helmholtz energy equations, the GERG-2008 model for natural gas, and the AGA8 equation. Fluid and Mixture Library

T = c_double(300) P = c_double(1000) rho = c_double(0) h = c_double(0) s = c_double(0) nist refprop 9

For mixtures not explicitly calibrated (e.g., a proprietary blend), REFPROP 9 uses a mixing rule for viscosity. Always validate against a single experimental data point if possible, or simply note the increased uncertainty in your reports. : Implements high-accuracy Helmholtz energy equations