Nitrogen - Thermophysical Properties

Thermophysical properties of Nitrogen (N2) at standard conditions (25°C, 77°F, 298 K) and atmospheric pressure. Includes molecular weight, density, viscosity, thermal properties, critical points, and phase behavior information.

Property	Value	Unit (SI)	Unit (Imperial)
Molecular Weight	28.013	g/mol	g/mol
Specific Gravity (air = 1)	0.967	-	-
Specific Volume	0.872	m³/kg	13.98 ft³/lb
Density of Liquid @ 1 atm	808.4	kg/m³	50.46 lb/ft³
Absolute Viscosity	0.018	cP	12.1×10⁻⁶ lbm/ft·s
Sound Velocity in Gas	353	m/s	1158 ft/s
Specific Heat (cp)	1040	J/kg·K	0.249 Btu/lb·°F
Specific Heat Ratio (cp/cv)	1.40	-	-
Gas Constant (R)	297	J/kg·°C	55.2 ft·lb/lb·°R
Thermal Conductivity	0.026	W/m·°C	0.015 Btu/hr·ft·°F
Boiling Point @ 1 atm	-195.8	°C	-320.4 °F
Latent Heat of Evaporation	199000	J/kg	85.5 Btu/lb
Freezing/Melting Point @ 1 atm	-210	°C	-346 °F
Latent Heat of Fusion	25800	J/kg	11.1 Btu/lb
Critical Temperature	-147	°C	-232.6 °F
Critical Pressure	3.40	MN/m²	493 psia
Critical Volume	0.00318	m³/kg	0.051 ft³/lb
Flammable	No	-	-