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Ethane - Thermophysical Properties

Chemical, Physical and Thermal Properties of Ethane - C2H6.

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The phase diagram of ethane is shown below the table.

Chemical, physical and thermal properties of Ethane - C2H6 :
(values at 25oC (77oF, 298 K) and atmospheric pressure)

Molecular Weight 30.07
Specific Gravity (air = 1) (1.013 bar and 15 °C (59 °F)) 1.047
Density of liquid at atmospheric pressure at boiling point (lb/ft3, kg/m3) 34.1, 546.49
Absolute Viscosity (lbm/ft s, centipoises) 6.4 10-6, 0.0094
Sound velocity in gas (m/s) 316
Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) 0.41, 1715
Specific Heat Ratio - cp/cv 1.20
Gas constant - R - (ft lb/lboR, J/kgoC) 51.4, 276
Thermal Conductivity (Btu/hr ft oF, W/moC) 0.010, 0.017
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oC) -127, -88.3
Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) 210, 488000
Freezing or Melting Point  at 1 atm (oF, oC) -278, -172.2
Latent Heat of Fusion (Btu/lb, J/kg) 41, 95300
Critical Temperature (oF, oC) 90.1, 32.2
Critical Pressure (psia, MN/m2) 709, 4.89
Critical Volume (ft3/lb, m3/kg) 0.076, 0.0047
Flammable yes
Heat of combustion (Btu/lb, kJ/kg) 22300, 51800

Follow the links below to get values for the listed properties of ethane at varying pressure and temperature:

See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure,
as well as Thermophysical properties of: Acetone, Acetylene, Air, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D2O.

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Ethane is a gas at standard conditions. However, at low temperature and/or high pressures the gas becomes a liquid or a solid.

The ethane phase diagram shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the ethane boiling point with changes in pressure. It also shows the saturation pressure with changes in temperature.

Ethane phase diagram

At the critical point there is no change of state when pressure is increased or if heat is added.

The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.

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