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

Butane - Thermophysical Properties

Chemical, physical and thermal properties of n-Butane.

The phase diagram of butane is shown below the table.

Chemical, physical and thermal properties of n-Butane  - C 4 H 10 :
(values at 25 oC (77 oF, 298 K) and atmospheric pressure)

Butane - Thermophysical Properties
Molecular Weight 58.12
Specific Gravity , air = 1 2.07
Specific Volume ( ft3 /lb, m3 /kg ) 6.5, 0.405
Density of liquid at atmospheric pressure ( lb/ft3, kg/m3 ) 37.5, 604
Vapor pressure at 25 oC ( psia, MN/m2 ) 35.4, 0.244
Absolute Viscosity ( lbm /ft s, centipoises ) 4.8 10-6, 0.007
Sound velocity in gas ( m/s ) 216
Specific Heat - cp - ( Btu/lb oF or cal/g oC, J/kgK ) 0.39, 1675
Specific Heat Ratio - cp /cv 1.096
Gas constant - R - ( ft lb/lb o R, J/kg oC ) 26.56, 143
Thermal Conductivity ( Btu/hr ft oF, W/m oC ) 0.01, 0.017
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - ( oF, oC ) 31.2, -0.4
Latent Heat of Evaporation at boiling point ( Btu/lb, J/kg ) 165.6, 386000
Freezing or Melting Point  at 1 atm ( oF, oC ) -217, -138
Latent Heat of Fusion ( Btu/lb, J/kg ) 19.2, 44700
Critical Temperature ( oF, oC ) 306, 152
Critical Pressure ( psia, MN/m2 ) 550, 3.8
Critical Volume ( ft3 /lb, m3 /kg ) 0.070, 0.0043
Flammable yes
Heat of combustion ( Btu/ft3, Btu/lb, kJ/kg ) 3300, 21400, 49700

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

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

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

Butane 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). Butane - 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