ANyone know average specific gravity of most pump gas?
07-07-2005, 09:47 AM
#2
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Not a very ideal thing to find out.
Gasoline is a mixture of various organic compounds ( o,m,p-Xylene , Benzene, etc...) All of those compounds have chemical formulas between C6H14 and C12H26, with different specific gravities, but a good "average" compound is supposed to be C8H18. This means that molecular weight is (12.01 x 8) + (1.01 x 18) = 114.26 grams/mole
Now, an average pump gas at BP is sure different than Mobil, or Shell....
Ultimately, I can get you specific gravity (density) for each individual compound, but not a composite...unless you know the make up....
Use Density = Mass/Volume and PV = nRT formulas to calculate the rough density....but that is a very rough estimate....
I'm sure there was a study done, and it's published on the internet....
Good Luck
Gasoline is a mixture of various organic compounds ( o,m,p-Xylene , Benzene, etc...) All of those compounds have chemical formulas between C6H14 and C12H26, with different specific gravities, but a good "average" compound is supposed to be C8H18. This means that molecular weight is (12.01 x 8) + (1.01 x 18) = 114.26 grams/mole
Now, an average pump gas at BP is sure different than Mobil, or Shell....
Ultimately, I can get you specific gravity (density) for each individual compound, but not a composite...unless you know the make up....
Use Density = Mass/Volume and PV = nRT formulas to calculate the rough density....but that is a very rough estimate....
I'm sure there was a study done, and it's published on the internet....
Good Luck
07-10-2005, 12:35 PM
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Originally Posted by AdamSS
Not a very ideal thing to find out.
Now, an average pump gas at BP is sure different than Mobil, or Shell....
Now, an average pump gas at BP is sure different than Mobil, or Shell....
I'm assuming these variances come from the additives added to the gasoline? The reason I say this is most gasolines are "fungible" meaning they all come from the same place. Granted most companies have there own refinering, but instead of 10 companies running 10 pipelines, they usually share 1 or 2 pipelines. They produce a product that meets certains specs and they can add it to the system. So a refinery in Texas can add 100 gallons to the pipeline, which allows them to take 100 gallons out up in New York. What makes them different is the additives package once the gasoline is removed.
