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Refrigerants & gases

Nitrogen · N2

Nitrogen (N2, CAS 7727-37-9) is an industrial and utility gas; this page gives its density, heat capacity and viscosity from 1 to 500 bar and -20 to 100 °C.

Values are computed from CoolProp==6.6.0 - reference Helmholtz equation of state for Nitrogen (single-phase density, isobaric heat capacity and dynamic viscosity) and tabulated over 1–500 bar (absolute) and -20–100 °C.

Also known as
N2, dinitrogen, GAN, gaseous nitrogen
CAS number
7727-37-9
Tabulated range
1–500 bar · -20–100 °C
Identity
Molar mass
28.014g/mol
Critical temperature
-146.96°C
Critical pressure
33.958bar
Normal boiling point
-195.8°C

NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, nitrogen (N2, CAS 7727-37-9): molar mass, critical point and normal boiling point. https://webbook.nist.gov/cgi/fluid.cgi?ID=C7727379&Action=Page

At 25 °C
reference snapshot
Density · 1 bar
1.1303kg/m³
Density · 500 bar
414.0kg/m³
Heat capacity · 1 bar
1041J/kg·K
Viscosity · 1 bar
17.805uPa.s
Compressibility · 500 bar
1.365Z
Explore

Read a value at any pressure and temperature

Set a pressure (bar absolute) and a temperature (°C) to interpolate between the tabulated grid points. The readout and chart never go outside the validated 1–500 bar and -20–100 °C range, and every number is interpolated from the committed table below — nothing is computed from an equation of state in your browser.

Interactive explorer

Values are interpolated between the tabulated grid points below — pressure (bar absolute) and temperature (°C) stay within the validated 1–500 bar and -20–100 °C range and are never extrapolated.

1 bar
25 °C
Density
1.1303 kg/m³
Specific volume
0.8847 m³/kg
Compressibility Z
0.9998
Heat capacity
1041 J/kg·K
Viscosity
17.805 uPa.s
Density (kg/m³) vs pressure (bar) for N2 at 25 °C — Nitrogen.
Full tables

Every tabulated point

Rows are temperature (°C); columns are pressure (bar absolute). Read the cell at the intersection. Density is the single-phase fluid density at that state.

Density — kg/m³
°C \ bar125102050100200300500
-201.33192.66576.678713.4026.9868.50138.2263.6357.5477.3
01.23402.46926.181012.3924.8762.65125.2238.6327.5447.1
151.16962.33995.854411.7223.5058.94117.2223.2308.3426.6
251.13032.26105.655511.3222.6756.73112.5214.1296.8414.0
501.04262.08535.213310.4320.8451.93102.5194.8271.8385.4
750.96761.93514.83599.665419.3047.9494.29179.1251.1360.7
1000.90271.80514.50999.009717.9844.5587.43166.0233.6339.0
Isobaric heat capacity — J/kg·K
°C \ bar125102050100200300500
-201042104410511064108911671293144814841461
01041104310501060108011431241137414211421
151041104310481057107511291213133013801393
251041104310481056107311221198130613561376
501042104310471054106711071168125813061337
751042104310471052106410961146122312681303
1001043104410471052106110891131119612371275
Dynamic viscosity — uPa.s
°C \ bar125102050100200300500
-2015.65515.67215.72215.81116.00716.74818.47023.07928.26738.605
016.62916.64316.68916.76916.94417.59619.07122.96627.34636.401
1517.33917.35317.39517.47017.63218.22919.56023.04926.96935.182
2517.80517.81817.85817.92918.08418.64819.89823.16026.82334.536
5018.94018.95118.98819.05119.18919.68620.76823.57026.72333.378
7520.03720.04820.08120.13820.26220.70521.65624.10726.87732.710
10021.10121.11121.14121.19321.30521.70422.55124.72427.19432.382
Typical values

Nitrogen density at pressure (25 °C)

At 100 bar and 25 °C, nitrogen density is about 112.5 kg/m³. At 200 bar and 25 °C, nitrogen density is about 214.1 kg/m³. At 300 bar and 25 °C, nitrogen density is about 296.8 kg/m³. At 500 bar and 25 °C, nitrogen density is about 414.0 kg/m³.

Sources

Where the numbers come from

Every value on this page is computed by a deterministic equation of state — none is entered by hand. The generating method and the references it is checked against:

  • ▸NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems (REFPROP-derived isothermal tables), nitrogen (CAS 7727-37-9)
  • ▸CoolProp 6.6.0 - reference Helmholtz equation of state for Nitrogen (Span, Lemmon, Jacobsen, Yokozeki & Penoncello, 2000); dynamic viscosity from the Lemmon & Jacobsen, 2004 model

Model: CoolProp==6.6.0 - reference Helmholtz equation of state for Nitrogen (single-phase density, isobaric heat capacity and dynamic viscosity) · Generated 2026-06-07

The committed data file for this page is published as JSON on GitHub under CC BY 4.0.

Validation

Checked against cited values

The equation of state is cross-checked against independently cited NIST WebBook reference points — a near-ambient and a compressed density, plus the heat-capacity and viscosity columns. The page is published only because every check passes.

Property / pointDensity · 1 bar · 25 °C
Cited reference value1.1303 kg/m3
Model computed1.1303 kg/m3
Error vs reference0.003% (tolerance 1%)

NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, nitrogen (N2, CAS 7727-37-9), isothermal table at 298.15 K: density at 1 bar = 1.1303 kg/m3. https://webbook.nist.gov/cgi/fluid.cgi?ID=C7727379&Action=Page

Property / pointDensity · 200 bar · 25 °C
Cited reference value214.12 kg/m3
Model computed214.1213 kg/m3
Error vs reference0.001% (tolerance 1%)

NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, nitrogen (N2, CAS 7727-37-9), isothermal table at 298.15 K: density at 200 bar = 214.12 kg/m3. https://webbook.nist.gov/cgi/fluid.cgi?ID=C7727379&Action=Page

Property / pointIsobaric heat capacity · 1 bar · 25 °C
Cited reference value1041.3 J/kg.K
Model computed1041.3 J/kg.K
Error vs reference0.003% (tolerance 2%)

NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, nitrogen (N2, CAS 7727-37-9), isothermal table at 298.15 K: isobaric heat capacity Cp at 1 bar = 1041.3 J/kg.K. https://webbook.nist.gov/cgi/fluid.cgi?ID=C7727379&Action=Page

Property / pointDynamic viscosity · 1 bar · 25 °C
Cited reference value17.805 uPa.s
Model computed17.805 uPa.s
Error vs reference0.002% (tolerance 2%)

NIST Chemistry WebBook, SRD 69 - Thermophysical Properties of Fluid Systems. NIST Chemistry WebBook, SRD 69, Thermophysical Properties of Fluid Systems, nitrogen (N2, CAS 7727-37-9), isothermal table at 298.15 K: dynamic viscosity at 1 bar = 17.805 uPa.s. https://webbook.nist.gov/cgi/fluid.cgi?ID=C7727379&Action=Page

Limitations

Before you use these numbers

  • ▸CoolProp reference Helmholtz equation of state (Span, Lemmon, Jacobsen, Yokozeki & Penoncello, 2000) for nitrogen; dynamic viscosity from the Lemmon & Jacobsen, 2004 model. Single-phase density, isobaric heat capacity and dynamic viscosity, tabulated on a 1-500 bar (absolute) by -20 to 100 degC grid; two-phase, saturation and liquid states are out of scope for this page. The correlation is not extrapolated beyond the tabulated range. Values are for preliminary design; verify against vendor or reference data for critical service.
  • ▸Every tabulated state is single-phase. A grid cell is left blank only where the state at that pressure and temperature would be two-phase or liquid - at or above the saturation pressure at that temperature - and the explorer will not interpolate across such a cell. Because the critical temperature of nitrogen is -146.96 degC, below the -20 degC floor of this grid, every (pressure, temperature) point tabulated here is a supercritical single-phase fluid, so no cell is blank.
  • ▸Values are tabulated only inside the 1–500 bar and -20–100 °C ranges shown; the equation of state is not extrapolated beyond them here.
  • ▸Use for preliminary design; verify for critical service.
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