Octane
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- This article is about the real-life chemical compound. For the Transformers character, see Octane (Transformers).
| General | |
|---|---|
| Molecular formula | C8H18 |
| CAS number | 111-65-9 |
| EC number | 203-892-1 |
| Annex I Index number | 601-009-00-8 |
| Physical characteristics | |
| Appearance | Colourless liquid |
| Melting point | -57° Celsius |
| Boiling point | 126° Celsius |
| Vapour density | - |
| Vapour pressure | 11 mm Hg at 20° Celsius |
| Specific gravity | 0.703 |
| Flash point | 15° Celsius (closed cup) |
| Explosion limits | 0.96 - 6.5 % |
| Autoignition temperature | 220° Celsius |
| Critical temperature | 295.7° Celsius |
Octane is an alkane hydrocarbon with the chemical formula CH3(CH2)6CH3. It has many isomers.
One of the isomers, iso-octane or 2,2,4-Trimethylpentane, is of major importance, as it has been selected as the 100 point on the octane rating scale, with n-heptane as the zero point. Octane ratings are ratings used to represent the anti-knock performance of petrol, given as the percentage of 2,2,4-trimethylpentane in an 2,2,4-trimethylpentane / n-heptane mixture that would have the same performance. It is an important constituent of gasoline.
See also
External links
- Material Safety Data Sheet for Octane (http://physchem.ox.ac.uk/MSDS/OC/octane.html)
- http://www.ars-grin.gov/cgi-bin/duke/chemical.pl?OCTANE
| Alkanes | |||||||||||||||||||||||||||||||
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methane |
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ethane |
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propane |
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butane |
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pentane |
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hexane | |||||||||||||||||||||
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heptane |
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octane |
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nonane |
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decane |
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undecane |
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dodecane |
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tridecane |
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tetradecane |
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pentadecane |
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hexadecane |
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heptadecane |
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octadecane |
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nonadecane |
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eicosane |
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heneicosane |
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docosane |
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tricosane |
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tetracosane |
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pentacosane |
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hexacosane |
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heptacosane |
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octacosane |
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nonacosane |
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triacontane |
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hentriacontane |
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dotriacontane |
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tritriacontane |
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tetratriacontane |
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pentatriacontane |
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hexatriacontane |
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