Science Fair Project Encyclopedia
Octane
| 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, 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
03-10-2013 05:06:04
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details