Other Definitions
octane (dict)
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Octane | big>Octane | | gcolor="#a0ffa0" colspan="2"| General | | lign="left"| Molecular formula | C8H18 | | lign="left"| CAS number | 111-65-9 | | lign="left"| EC number | 203-892-1 | | lign="left"| Annex I Index number | 601-009-00-8 | | gcolor="#a0ffa0" colspan="2"| Physical characteristics | | lign="left"| Appearance | Colourless liquid | | lign="left"| Melting point | -57 Celsius | | lign="left"| Boiling point | 126 Celsius | | lign="left"| Vapour density | - | | lign="left"| Vapour pressure | 11 mm Hg at 20 Celsius | | lign="left"| Specific gravity | 0.703 | | lign="left"| Flash point | 15 Celsius (closed cup) | | lign="left"| Explosion limits | 0.96 - 6.5 % | | lign="left"| Autoignition temperature | 220 Celsius | | lign="left"| 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, the iso-octane 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
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