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Unit 2 Fuels

Started by ilovesummer, Jan 12 2011 06:19 PM

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#1 ilovesummer

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Posted 12 January 2011 - 06:19 PM

just doing some revision for my prelim thats coming up soon and i am not sure what the octane rating is ?

why is it called that because benzene does have anything to do with the number 8 ?

sorry if that does not make any sense to you but thankyou for taking your time to read this :)

#2 Marcus

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Posted 12 January 2011 - 06:43 PM

View Postilovesummer, on 12 January 2011 - 06:19 PM, said:

just doing some revision for my prelim thats coming up soon and i am not sure what the octane rating is ?

why is it called that because benzene does have anything to do with the number 8 ?

sorry if that does not make any sense to you but thankyou for taking your time to read this :)

I didn't think octane ratings were in higher... but anyways

Octane rating is a scale measuring the 'anti-knocking' properties of a fuel as compared to octane (more specifically 2,2,4-trimethylpentane), ie a fuel with an octane rating of 100 is the same as pure octane, whereas an octane rating of 80 has the same properties as an 80% octane mixture (the remaining 20% is taken as heptane). Roughly the scale measures the activation energies of the combustion of the fuel.
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