Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Argon - Thermophysical Properties

Chemical, Physical and Thermal Properties of Argon.

Argon phase diagram

Chemical, physical and thermal properties of Argon  - Ar :

Argon - Thermophysical Properties
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/lb oF or cal/g oC, J/kgK ) 0.125, 523
Specific Heat Ratio - cp /cv 1.67
Gas constant - R - ( ft lb/lb o R, J/kg oC ) 38.7, 208
Thermal Conductivity ( Btu/hr ft oF, W/m oC ) 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 .

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.

Argon 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.

Related Topics

  • Material Properties

    Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

Related Documents


Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .


This page can be cited as

  • The Engineering ToolBox (2008). Argon - Thermophysical Properties. [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter