An hydrocarbon of the paraffin series. It is liquid at ordinary atmospheric conditions, although small amounts may be present in the gas associated with petroleum.

a measure of the anti-knocking value of gasoline

For a gasoline engine to work efficiently, gasoline must burn smoothly without premature detonation, or knocking. Severe knocking can dissipate power output and even cause damage to the engine. When gasoline engines became more powerful in the 1920s, it was discovered that the most extreme knocking effect was produced by a fuel composed of pure normal heptane, while the least knocking effect was produced by pure isooctane. This discovery led to the development of the octane scale for defining gasoline quality.

Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders.

(1) An alkane having the formula C8H18. Flash point 56°F. Explosive limits of 1% to 3.2%. (2) A measure of the resistance of a sample of gasoline to premature ignition (knocking). 100 octane fuel has the knocking resistance of 100% iso-octane (2, 2, 4-trimethyl pentane). Zero octane fuel has the knocking resistance of a mixture of 89% iso-octane and 11% n-heptane.

any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent

Measure of the anti-knock properties of gasoline.

A petrol rating of how quickly the fuel burns. The higher the rating, the slower and more controlled the fuel burns. This allows its use in high compression engines.

A measure of a motor gasoline's or blendstock's resistance to preignition (knocking). The industry commonly uses two different indexes of this quality RON (research octane number), and MON (motor octane number). The USA employs an average of the two: (R+M)/2.

A rating scale used to grade gasoline as to its antiknock properties. Also any of several isometric liquid paraffin hydrocarbons, C8H18. Normal octane is a colorless liquid found in petroleum boiling at 124.6 degrees Celsius.

A numeric rating of gasoline's resistance to detonation (premature ignition). The higher the octane number, the less chance of detonation. High octane (above 91) is usually worthwhile only if the manufacturer specifically recommends it. Octane is actually a hydrocarbon(C8H18).

Describes the grade of gasoline and its resistance to engine knock.

(C8H18) Compare with alkane and hydrocarbon. Flammable liquid compounds found in petroleum and natural gas. There are 18 different octanes- they have different structural formulas but share the molecular formula C8H18. Octane is used as a fuel and as a raw material for building more complex organic molecules. It is the eighth member of the alkane series.

A flammable liquid hydrocarbon found in petroleum. Used as a standard to measure the anti-knock properties of motor fuel.

A gasoline's ability to resist detonation. The higher the octane number, the greater the fuel's resistance to detonation.

Family of alkane molecules, formula C8H18. Several different isomers exist with different structures but the same chemical formula. One of the isomers, 2,3,4-trimethylpentane, is the standard for knock properties in automobile engines. The octane rating measures the percentage of 2,3,4-trimethylpentane in a mixture with heptane that would give the same knock characteristics as the fuel under test.

A way of describing a fuels resistance to detonating (pinging) The higher the octane, the better it will resist detonation. Fuel is commonly available in octanes from 85 - 100. Turbo Skylines are designed for 95 Octane fuel. Race fuel is available up to 116 Octane. In the 1950's there was some exotic 140+ octane fuel used for the large propliners on takeoff.

Octane is an alkane with the chemical formula CH3(CH2)6CH3. It has 18 isomers.