National Institute of Standards and Technology

NIST Chemistry WebBook, SRD 69

Thermophysical Properties of Fluid Systems

Accurate thermophysical properties are available for several fluids. These data include the following:

Density
C_p
Enthalpy
Internal energy
Viscosity
Joule-Thomson coefficient

Specific volume
C_v
Entropy
Speed of Sound
Thermal conductivity
Surface tension (saturation curve only)

Please follow the steps below to select the data required.

Please select the species of interest:

Please choose the units you wish to use:

Temperature Kelvin Celsius Fahrenheit Rankine

Velocity m/s ft/s mph

Viscosity µPa*s Pa*s cP lbm/ft*s

Surface tension^* N/m dyn/cm lb/ft lb/in

^*Surface tension values are only available along the saturation curve.

Choose the desired type of data:

Data type Isothermal properties Isobaric properties Isochoric properties Saturation properties — temperature increments Saturation properties — pressure increments
Please select the desired standard state convention:

Standard state convention Default for fluid Normal B.P. convention ASHRAE convention IIR convention

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