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skeletal structure of a propane molecule
displayed structure of a propane molecule
3D model of a propane molecule
IUPAC name
EC Number 12121
MeSH Propane
UN number 1978
Molar mass 48.13 g·mol−1
Appearance Colorless gas
Density 1.83 kg/m3, gas
0.5077 kg/L, liquid
Melting point −187.6 °C (85.5 K)
Boiling point −42.09 °C (231.1 K)
0.1 g/cm3 (37.8 °C)
Highly flammable (F+)
R-phrases (outdated) R12
S-phrases (outdated) (S2), S9, S16
NFPA 704
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g., propane Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Explosive limits 2.37–9.5%
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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Propane is a three-carbon alkane, normally a gas, but compressible to a liquid that is transportable. It is derived from other petroleum products during oil or natural gas processing. It is commonly used as a fuel for engines, barbecues, and home heating systems.

When sold as fuel, it is commonly known as liquified petroleum gas (LPG or LP-gas), which can be a mixture of propane along with small amounts of propylene, butane, and butylene. The odorant ethanethiol is also added so that people can easily smell the gas in case of a leak.

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