Table 2. Properties Computed by REFPROP.

thermodynamic properties	transport, misc. prop.	derivatives	mixture
Temperature, T	Thermal conductivity	Isothermal compressibility	Fugacity
Pressure, p	Viscosity	Volume expansivity	Fugacity coeff.
Density, ρ	Kinematic viscosity	Isentropic expansion coef.	Chemical potential
Volume, V	Thermal diffusivity	Isothermal expansion coef.	K value
Internal Energy, U	Prandtl Number	Adiabatic compressibility	Molar mass
Enthalpy, H	Surface tension	Adiabatic bulk modulus	B12
Entropy, S	Dielectric constant	Isothermal throttling coeff.	Excess Volume
Isochoric Heat Capacity, Cv	Gross heating value (HV)	∂p/∂ρ|T	Excess Helmholtz
Isobaric heat capacity, Cp	Gross HV, liquid	∂2p/∂ρ2|T	Excess Gibbs
Ideal Gas Cp0	Gross HV, volume basis	∂p/∂T|ρ	Composition
The ratio Cp/Cv	Net Heating Value	∂2p/∂T2|ρ
Csat	Net HV, liquid	∂2p/∂ρ∂T
Speed of sound, w	Net HV, volume basis	∂p/∂T|sat
Compressibility Factor, Z	Heat of Formation	∂H/∂Z|sat
Joule-Thomson Coefficient	Acentric factor	∂ρ/∂T|p
Quality	Relative density (air)	∂ρ/∂P|T
Phase	Relative density (water)	∂2ρ/∂T2|p
2nd virial coefficient, B	API gravity	∂2ρ/∂p2|T
3rd virial coefficient, C	2nd acoustic virial	∂2ρ/∂p∂T
4th virial coefficient, D	3rd acoustic virial	dB/dT
Helmholtz energy	–1/T	∂H/∂T|ρ
Gibbs energy	Flow exergy	∂H/∂T|p
Heat of vaporization	Closed system exergy	∂H/∂ρ|T
Cv, 2-phase	Critical flow factor	∂H/∂ρ|p
Internal pressure	Throat mass flux	∂H/∂p|T
Repulsive pressure	Fpv	∂H/∂p|ρ
Attractive pressure
p–pideal