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The octane rating of a substance is a measure of its resistance to autocombustion when compressed. By definition, isooctane has an octane rating of 100, and n-heptane a rating of 0, and all others are in comparison to these two.
There are various ways to measure the octane rating of a substance. On way is determined by running the fuel through a specific test engine with a variable compression ratio under controlled conditions, and comparing these results with those for mixtures of isooctane and n-heptane.
For other more information, and for the source of this information, see the Wikipedia link under the Web Links to the left of this answer.
What else can I help you with?
what is the molecular mass of water vapour?
The molecular mass of water vapour is 18.01528
What is the different between vapour and steam?
If you look carefully at a boiling kettle, water vapour is the white vapour you can see. Steam is actually the invisible short section between the spout of the kettle and the start of the water vapour.
What is the difference between water vapour and steam?
the difference is that water vapour is just one particle that joins together with more and more to form steam
Can water vapour be turned back to liquid?
Yes, in the atmosphere water vapour falls as rain.
What instrument is used to measure water vapour in the atmosphere?
A hygrometer is used to measure water vapor in the atmosphere. This instrument can measure humidity levels in the air to determine the amount of water vapor present.
Is it possible to have water vapour at -10degrees?
Yes at low enough pressures
How do you calculate vapour pressure from an EOS?
Use the Equation of State (EOS) in combination with the Antoine's Equation to determine vapor pressure.
Can you smell the vapour in the room?
No. Vapour does not smell.
How is vapour used in a sentence?
The water vapour condensed on the windows. The vapour rising off the acid made me choke.
Why does your petrol fiat stilo have white smoke coming out of the exhaust?
White smoke is water vapour. Possible head gasket problems
Will mercury vapour work in a sodium vapour fixture?
no
Is Mercury vapour compressable?
Any vapour is compressible.
Is vapour invisible?
Whi many are, many are not (iodine vapour is quite easily seen, for example, where water vapour is not).
What do you call when solid is changed into gas?
sublimation. for example when camphor is heated at atmospheric pressure it will not melt but get sublimed into vapour phase. similarly it is possible to sublime ice into water vapour without converting into liquid-water by applying very low pressure.
Where do clouds go to?
Clouds are actually nothing more than water vapour (mist), carried on the wind. When the water vapour gathers into bigger droplets of water, it usually rains. A lot depends on temperature, with rain, snow, sleet, hail, being possible results.
Is vapour a solid liquid or a gas?
As the word "vapour" indicates, it is a gas.
What is wet vapor?
Wet Vapour is the region which contains a mixture of liquid and vapour. The liquid is saturated liquid and the vapour is saturated vapour. The temperature stays uniform until the entire phase change is complete.
