This application enables data on many gas molecules to be accessed rapidly.
In mixture with argon, methane is used in Geiger counter and for the detector in X Ray Fluorescence (XRF) as quentching gas.
Molecular Weight
Molecular weight : 16.043 g/mol Solid phase
Melting point : -182.5 °C Latent heat of fusion (1,013 bar, at triple point) : 58.68 kJ/kg Liquid phase
Liquid density (1.013 bar at boiling point) : 422.62 kg/m3 Liquid/gas equivalent (1.013 bar and 15 °C (59 °F)) : 630 vol/vol Boiling point (1.013 bar) : -161.6 °C Latent heat of vaporization (1.013 bar at boiling point) : 510 kJ/kg Critical point
Critical temperature : -82.7 °C Critical pressure : 45.96 bar Gaseous phase
Gas density (1.013 bar at boiling point) : 1.819 kg/m3 Gas density (1.013 bar and 15 °C (59 °F)) : 0.68 kg/m3 Compressibility Factor (Z) (1.013 bar and 15 °C (59 °F)) : 0.998 Specific gravity (air = 1) (1.013 bar and 21 °C (70 °F)) : 0.55 Specific volume (1.013 bar and 21 °C (70 °F)) : 1.48 m3 /kg Heat capacity at constant pressure (Cp) (1 bar and 25 °C (77 °F)) : 0.035 kJ/(mol.K) Heat capacity at constant volume (Cv) (1 bar and 25 °C (77 °F)) : 0.027 kJ/(mol.K) Ratio of specific heats (Gamma:Cp/Cv) (1 bar and 25 °C (77 °F)) : 1.305454 Viscosity (1.013 bar and 0 °C (32 °F)) : 0.0001027 Poise Thermal conductivity (1.013 bar and 0 °C (32 °F)) : 32.81 mW/(m.K) Miscellaneous
Solubility in water (1.013 bar and 2 °C (35.6 °F)) : 0.054 vol/vol Autoignition temperature : 595 °C Go back to choosing the units
The vapor pressure curve may be obtained by clicking on the image. On the graph, pressure is in bar or 0.1 MPa, temperature in K or °C. The critical point is indicated by a black spot on the liquid-vapor equilibrium curve.
Liquid to gas conversion
This module enables a volume (measured at 1 atmosphere and boiling point) or a mass of liquid gas to be converted into a volume or a mass of gas measured at 1 atmosphere and 15 °C.
Data : liquid Phase3 ) or mass
Gas to liquid conversion
This module enables a volume (measured at 1 atmosphere and 15 °C) or a mass of gas in gaseous phase to be converted into a mass or a volume of liquid (measured at 1 atmosphere and boiling point).
Data : Gas Phase3 ) or mass
Go back to choosing the units
The European Material Safety Data Sheets (MSDS) are made available for information only. Visitors to this site may only use them at their own risk. The MSDSs were prepared by EIGA ( the European Industrial Gas Association) according to European Union standards. Although Air Liquide believes the information in the MSDSs to be correct, Air Liquide cannot be held responsible in any event if the contents do not meet the regulatory requirements of countries outside the European Union. Material Safety Data Sheets are subject to revision. Refer to this web site to ensure that you have the latest version.
Major hazard : Fire and High Pressure Toxicity (Am. Conf. Of Gov. Ind. Hygienists ACGIH 2000 Edition) : Simple Asphyxiant Flammability limits in air (STP conditions) : 5.0-15.0 vol% Odour : None UN Number : UN1971 (gas); UN1972 (liquid refrigerated) EINECS Number : 200-812-7 DOT Label (USA) : NFG DOT Hazard class (USA) : Flammable Gas Air Liquide has assembled data on the compatibility of gases with materials to assist you in evaluating which products 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: ISO 11114-1 (Jul 1998), Part 2: ISO 11114-2 (Mar 2001)), it must be used with extreme caution. No raw data such as this can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is used to choose possible materials and then more extensive investigation and testing is carried out under the specific conditions of use. The collected data mainly concern high pressure applications at ambiant temperature and the safety aspect of material compatibity rather than the quality aspect.
Material
Compatibility
Metals
General Behavior : Risk of corrosion by gas contained impurities in presence of moisture; see compatibility with CO, CO2, H2S.
Stainless Steel
Satisfactory
Plastics
Polyamide (PA) (NYLON™ )
Satisfactory
Polypropylene (PP)
Satisfactory
Elastomers
Nitrile rubber (NBR)
Satisfactory
Chloroprene (CR)
Satisfactory
Silicon (Q)
Non recommended
Lubricants
You can choose the units in which the values are displayed. By default, SI units are selected.
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