Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

Isothermal Properties for Nitrogen

Fluid Data

Isothermal Data for T = 12.000 C

Temperature (C)Pressure (bar)Density (kg/m3)Volume (m3/kg)Internal Energy (kJ/kg)Enthalpy (kJ/kg)Entropy (J/g*K)Cv (J/g*K)Cp (J/g*K)Sound Spd. (m/s)Joule-Thomson (K/bar)Viscosity (Pa*s)Therm. Cond. (W/m*K)Phase

Auxiliary Data

Reference States, default for fluid

Additional fluid properties


Equation of state, auxiliary model, and melting curve

Span, R.; Lemmon, E.W.; Jacobsen, R.T.; Wagner, W.; Yokozeki, A., A Reference Equation of State for the Thermodynamic Properties of Nitrogen for Temperatures from 63.151 to 1000 K and Pressures to 2200 MPa, J. Phys. Chem. Ref. Data, 2000, 29, 6, 1361-1433. [all data]

Auxiliary model

Jacobsen, R.T.; Stewart, R.B.; Jahangiri, M., Thermodynamic properties of nitrogen from the freezing line to 2000 K at pressures to 1000 MPa., J. Phys. Chem. Ref. Data, 1986, 15(2), 735-909. [all data]

Auxiliary model and dielectric constant

Younglove, B.A., Thermophysical Properties of Fluids. I. Argon, Ethylene, Parahydrogen, Nitrogen, Nitrogen Trifluoride, and Oxygen, J. Phys. Chem. Ref. Data, 1982, 11, 1-11. [all data]

Surface tension

Lemmon, E.W.; Penoncello, S.G., The Surface Tension of Air and Air Component Mixtures, Adv. Cryo. Eng., 1994, 39, 1927-1934. [all data]

Additional Information

Equation of state

The uncertainty in density of the equation of state is 0.02% from the triple point up to temperatures of 523 K and pressures up to 12 MPa and from temperatures of 240 to 523 K at pressures less than 30 MPa. In the range from 270 to 350 K at pressures less than 12 MPa, the uncertainty in density is 0.01%. The uncertainty at very high pressures (>1 GPa) is 0.6% in density. The uncertainty in pressure in the critical region is estimated to be 0.02%. In the gaseous and supercritical region, the speed of sound can be calculated with a typical uncertainty of 0.005% to 0.1%. At liquid states and at high pressures, the uncertainty increases to 0.5% - 1.5%. For pressures up to 30 MPa, the estimated uncertainty for heat capacities ranges from 0.3% at gaseous and gas like supercritical states up to 0.8% at liquid states and at certain gaseous and supercritical states at low temperatures. The uncertainty is 2% for pressures up to 200 MPa and larger at higher pressures. The estimated uncertainties of vapor pressure, saturated liquid density, and saturated vapor density are in general 0.02% for each property. The formulation yields a reasonable extrapolation behavior up to the limits of chemical stability of nitrogen.

Thermal conductivity

The uncertainty in thermal conductivity is 2%.


The uncertainty in viscosity is 2%, except in the dilute gas, where the uncertainty is 0.5%.

Important Information About This Data

The data above are from an older version of the NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP version 7). We will be updating our site to use the newer version (version 9.1) of this database in the the next couple of months. Information on REFPROP version 9.1 can be found here. REFPROP version 9.1 includes additional data and features not available from this site.