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Argon - Thermophysical Properties

Chemical, Physical and Thermal Properties of Argon

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Argon phase diagram

Chemical, physical and thermal properties of Argon  - Ar :

Molecular Weight 39.948
Specific Gravity 1.38
Specific Volume (ft3/lb, m3/kg) 9.8, 0.622
Density of liquid at atmospheric pressure (lb/ft3, kg/m3) 87.0, 1400
Absolute Viscosity (lbm/ft s, centipoises) 13.4 10-6, 0.02
Sound velocity in gas (m/s) 322
Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) 0.125, 523
Specific Heat Ratio - cp/cv 1.67
Gas constant - R - (ft lb/lboR, J/kgoC) 38.7, 208
Thermal Conductivity (Btu/hr ft oF, W/moC) 0.0102, 0.0172
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oC) -303, -186
Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) 70, 163000
Freezing or Melting Point  at 1 atm (oF, oC) -308.5, -189.2
Critical Temperature (oF, oC) -187.6, -122
Critical Pressure (psia, MN/m2) 707, 4.87
Critical Volume (ft3/lb, m3/kg) 0.0299, 0.00186
Flammable no

Follow the link below to get values for the listed properties of argon 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, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D2O.

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

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



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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