Air

CAS Number 132259-10-0
UN1002 (gas)

Molecule
Properties
Applications
Safety & Compatibility
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Liquid / Gas Volumes

Calculate the volume or mass of a quantity of gas or liquid

Liquid Phase

At boiling point at 1.013 bar

m³ (Volume)

kg (Mass)

Gas Phase

In standard conditions (1.013 bar, 15°C)

m³ (Volume)

kg (Mass)

Physical Properties

Download the set of data (XLS - 15.19 KB)

General Properties
Solid Phase
Liquid Phase
Gas Phase

Molecule phase diagram showing the transition phases between solid, liquid and gas as a function of temperature and pressure

Pressure (bar)

- Molar mass 28.960 g/mol
- Content in dry air /
Critical Point
- Temperature -140.70 °C
- Pressure 37.74 bar
- Density 316.61 kg/m³
Triple Point
- Temperature
- Pressure bar

Pressure 1.013 bar

Melting point

- 214 °C

Pressure 1.013 bar

0 °C
15 °C
25 °C

Compressibility factor Z	9.994E-1
Cp/Cv ratio γ	1.4028
Gas density	1.292 kg/m³
Heat capacity Cp	1.0059 kJ/(kg.K)
Heat capacity Cv	7.1709E-1 kJ/(kg.K)
Specific volume	7.738E-1 m³/kg
Thermal conductivity	24.36 mW/(m.K)
Viscosity	1.7218E-4 Po

Compressibility factor Z	9.996E-1
Cp/Cv ratio γ	1.4022
Gas density	1.225 kg/m³
Heat capacity Cp	1.0062 kJ/(kg.K)
Heat capacity Cv	7.1761E-1 kJ/(kg.K)
Specific volume	8.164E-1 m³/kg
Thermal conductivity	25.499 mW/(m.K)
Viscosity	1.7962E-4 Po

Compressibility factor Z	9.997E-1
Cp/Cv ratio γ	1.4018
Gas density	1.184 kg/m³
Heat capacity Cp	1.0065 kJ/(kg.K)
Heat capacity Cv	7.1803E-1 kJ/(kg.K)
Specific volume	8.448E-1 m³/kg
Thermal conductivity	26.247 mW/(m.K)
Viscosity	1.8447E-4 Po

Applications

Examples of uses of this molecule in Industry and Healthcare

Chemicals

Air is used as oxygen source for the synthesis of many organic compounds, such as ethylene dichloride, acrylonitrile and acrylic acid from propylene. Those three compounds are used for the production of plastics.

Hospital care

Air is used for the ventilation of patients.

Laboratories & Research Centers

Pure air is used to calibrate and run environmental emission monitoring equipement, industrial hygiene monitors and trace impurity analyzers. It is used as a balance gas for many calibration mixtures. Air is also used as combustion oxidizer for gas chromatograph flame ionization detectors and atomic absorption spectrometers.

Metal

Hot air is used for combustion in blast furnaces for the production of liquid metal from iron oxides.

Oil & Gas

Air is used as oxidizing compound in Claus process to convert sulfur into sulfur dioxide. Compressed air is widely used to action pneumatic systems for various equipment and instrumentation.

Safety & Compatibility

Major Hazards
Material Compatibility

GHS04

Gas under pressure

Odor

none

Metals

Aluminium	No data
Brass	No data
Monel	No data
Copper	No data
Ferritic Steel	No data
Stainless steel	No data
Zinc	No data
Titanium	No data

Plastics

Polytetrafluoroethylene	Violent reaction (oxidation/burning) Acceptable
Polychlorotrifluoroethylene	Violent reaction (oxidation/burning) Acceptable
Polyvinylidene fluoride	Violent reaction (oxidation/burning) Acceptable
Polyvinyl chloride	Violent reaction (oxidation/burning) Acceptable
Ethylene tetrafluoroethylene	No data
Polycarbonate	No data
Polyamide	Violent reaction (oxidation/burning) Acceptable
Polypropylene	Violent reaction (oxidation/burning) Acceptable

Elastomers

Butyl (isobutene- isoprene) rubber	Violent reaction (oxidation/burning) Acceptable
Nitrile rubber	Violent reaction (oxidation/burning) Acceptable
Chloroprene	Violent reaction (oxidation/burning) Acceptable
Chlorofluorocarbons	No data
Silicone	Violent reaction (oxidation/burning) Acceptable
Perfluoroelastomers	Violent reaction (oxidation/burning) Acceptable
Fluoroelastomers	Violent reaction (oxidation/burning) Acceptable
Neoprene	No data
Polyurethane	Violent reaction (oxidation/burning) Acceptable
Ethylene-Propylene	Violent reaction (oxidation/burning) Acceptable

Lubricants

Hydrocarbon based lubricant	Violent reaction (oxidation/burning) Acceptable
Fluorocarbon based lubricant	Violent reaction (oxidation/burning) Acceptable

Materials compatibility

Recommendations : Air Liquide has gathered data on the compatibility of gases with materials to assist you in evaluating which materials to use for a gas system. Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is only used to identify possible materials for applications at high pressure and ambient temperature. Extensive investigation and testing under the specific conditions of use need to be carried out to validate a material selection for a given application. Contact the regional Air Liquide team for expertise service.

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More information

The initial measurements of the constituents of air, with the exception of argon, were improved and summarized in the early 1800s by John Dalton. Earth's atmosphere is 78.09 % nitrogen, 20.94 % oxygen, 0.93 % argon, and 0.04 % carbon dioxide with very small percentages of other elements (neon, helium, krypton, methane, hydrogen, xenon and radon).