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What is octane number?

Updated: 8/9/2023
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11y ago

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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)

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16y ago
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11y ago

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.

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11y ago

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.

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11y ago

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.

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11y ago

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.

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11y ago

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.

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14y ago

what do u mean by octane number in gasoline?

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9y ago

The octane number of gasoline describes the performance of gasoline. The octane number is also used to measure the performance of aviation fuel.

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Continue Learning about Chemistry

The octane number of zero is assigned to?

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 higher boiling point than pentane because octane has a larger number of carbon atoms than propane


How many electrons are in octane?

66. Octane is C8H18. therefore the total number of electrons is 6*8 + 18*1


What is the common name for octane?

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.


What weight of oxygen is required to completely burn 19.8 g of 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.

Related questions

What is the measure of the antiknock properties in a fuel?

octane number


Why n-heptane has zero octane number?

see link about octane number


Is octane use?

Octane has not special application excepting the so-called octane number.


What number octane is made for 75 Cadillac?

93 octane works best.


What does octane mean?

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.


When you see an octane 95 RON what does the RON mean?

RON= research octane number


What is the octane number of aviation fluid?

100 octane. This is why aviation fuel (avgas) is typically called 100LL, which stands for 100 octane, low lead.


What is RON95?

Research Octane Number 95


What is the octane number?

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.


What the relation between aniline and octane number?

nkn


The octane number of zero is assigned to?

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 higher boiling point than pentane because octane has a larger number of carbon atoms than propane