The amount of resistance that a fuel has to detonation. The higher the number, the less likely it is that a particular fuel will detonate in a particular engine. The number is as compared to a standard fuel (not necessarily gasoline)
The octane number is a measure of performance of a fuel. It is measured relative to pure isooctane which is given an arbitrary value of 100. It is possible for fuels to have an octane number higher than 100.
The higher the octane number the more compression it takes for the fuel to detonate. Higher octane fuel is used usually in high performance vehicles where the engines have higher compression ratios.
If the octane number of a fuel isn't high enough it can lead to engine knocking this is where the fuel detonates before the fuel is at its maximum compressive state in the engine, this can cause damage and lower performance.
Iso-octane (2,2,4-Trimethylpentane) is the isomer that is the standard for the 100 point octane rating scale (the zero point is n-heptane). Higher octane numbers are now possible
through additives, but 100 percent iso-octane has the rating of 100.
Octane is a rating given to fuels, excluding diesel fuel,that determines their resistance to pre-donation or pinging. They higher the octane rating the more resistant it is to pre-detonation in a high compression engine. In a low compression engine there is no need for a high octane fuel. In fact putting a high-octane fuel in a low compression engine is a waste of money as there is no benefit gained.
Definition: Octane number is a value used to indicate the resistance of a motor fuel to knock. Octane numbers are based on a scale on which isooctane is 100 (minimal knock) and heptane is 0 (bad knock).
Also Known As: Octane Rating
Examples: A gasoline with an octane number of 92 has the same knock as a mixture of 92% isooctane and 8% heptane.
Propane has an octane rating of 103-110 depending on possible impurities.
While this may appear to be the ticket as a fuel for a high compression engine. Popane has a lower BTU rating than gasoline.
Propane has 91,000 Btu's per U.S. gallon while gasoline has approx. 114,000 Btu's per U.S. gallon.
Therefore propane has approx. 82% of the Btu's of gasoline, or less "bang for the buck".
Fuel mileage with a converted gasoline to propane engine, without any internal modifications will suffer somewhat. This can be offset partially by raising the compression ratio to 12-13 to 1.
One of the great advantages of propane is it can be stored for a much greater length of time than gasoline.
Sorry for the lengthy response.
what do u mean by octane number in gasoline?
The octane number of gasoline describes the performance of gasoline. The octane number is also used to measure the performance of aviation fuel.
Heptane has the number 0, and the number assigned to isooctane is 100. These two materials are used to grade the octane rating of petroleum fuels.This is called bracketing method.
Octane has a higher boiling point than pentane because octane has a larger number of carbon atoms than propane
66. Octane is C8H18. therefore the total number of electrons is 6*8 + 18*1
The molecular formula of octane is C8H18. It doesn't really have a "symbol."The "octane" in gasoline is actually "iso-octane" or 2,2,4-trimethylpentane. It has the same molecular formula, but the atoms are arranged differently than in n-octane.
The chemical equation for complete burning of octane is: 2 C8H18 + 25 O2 -> 16 CO2 + 18 H2O. This equation shows that 25 moles of diatomic oxygen are required to completely burn each two moles of octane. The gram molecular mass of octane is 114.23 and the gram molecular mass of diatomic oxygen is 2(15.9994). Therefore, the ratio of the mass of oxygen required to completely burn any given mass of octane to the mass of the octane to be burned is 50(15.9994)/2(114.23) or 3.5016, to the justified number of significant digits (the same as the number of digits in the least precisely specified datum 114.23, and the mass of oxygen required to burn 19.8 g of octane is (3.5016)(19.8) or 69.3 grams to the justified number of significant digits, now limited by the less precisely specified datum 119.8.
octane number
see link about octane number
Octane has not special application excepting the so-called octane number.
93 octane works best.
Octane rating is the resistance to burning. For example (not real number) a gas with an octane rating of 50 will burn at 100 degrees Fahrenheit whereas a gas with an octane rating of 100 will burn at 200 degrees Fahrenheit. Higher the octane number the harder it is to burn.
RON= research octane number
100 octane. This is why aviation fuel (avgas) is typically called 100LL, which stands for 100 octane, low lead.
Research Octane Number 95
The octane number is a measure of performance of a fuel. It is measured relative to pure isooctane which is given an arbitrary value of 100. It is possible for fuels to have an octane number higher than 100. The higher the octane number the more compression it takes for the fuel to detonate. Higher octane fuel is used usually in high performance vehicles where the engines have higher compression ratios. If the octane number of a fuel isn't high enough it can lead to engine knocking this is where the fuel detonates before the fuel is at its maximum compressive state in the engine, this can cause damage and lower performance.
nkn
Heptane has the number 0, and the number assigned to isooctane is 100. These two materials are used to grade the octane rating of petroleum fuels.This is called bracketing method.
Octane has a higher boiling point than pentane because octane has a larger number of carbon atoms than propane