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Old 20-01-2009, 18:48   #1
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which is heavier gas or diesel?

If I mixed the two and let it set which would rise to the top? Also, does unburned gas (not propane but regular pump gas) fumes rise or settle?
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Old 20-01-2009, 18:55   #2
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Gas fumes settle , being heavier than air.
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Old 20-01-2009, 19:08   #3
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Quote:
Originally Posted by Brent Swain View Post
Gas fumes settle , being heavier than air.
Brent
Thanks but what about the liquids?
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Old 20-01-2009, 19:12   #4
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I believe diesel will settle on the bottom.

From Wiki:
The density of petroleum diesel is about 0.85 kg/l (7.09 lbs/gallon(us)), about 18% more than petrol (gasoline), which has a density of about 0.72 kg/l (6.01 lbs/gallon(us)).
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Old 20-01-2009, 19:13   #5
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The weight of diesel fuel will vary. You can use 7.3 lbs. per US gal, but that is a rough guide. Gasoline is around 6 lbs. per US gal. Again, it will vary. Whether diesel will settle out of gasoline, I have no idea.
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Old 20-01-2009, 19:21   #6
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Since gasoline and diesel are complex mixtures of various hydrocarbons they do not have an exact, fixed density. However diesel is around 7 lbs/US gallon, gasoline about 6 lbs/US gallon.

I believe that gasoline and diesel will stay mixed and not separate when left to stand. Sort of like mixing water with your rum, the rum will not float to the top no matter how long you wait. The rum (or gasoline) having higher vapor pressures, will evaporate faster than the other component in the mix.
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Old 20-01-2009, 19:45   #7
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The question kind of makes no sense as either will solubalize the other - they mix and stay in equilibrium
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Old 20-01-2009, 21:46   #8
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Gas and diesel will mix and stay mixed and form a solution. They are both non-polar molecules. When I went to the naval firefighting school that's what they used as the fuel for the fires.

Diesel weighs 0.85kg/l. Gasoline weighs from 0.71kg/l to 0.77kg/l
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Old 25-02-2009, 09:23   #9
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It may help to understand basic distillation/fractionation columns as in,what they have in oil refineries to answer your question? Imagine a kettle of water,you slowly heat it up on a stove,until the water reaches boiling point (ie 100 Celsius) then you get steam,as the steam cools it turns back into water!So now, imagine a kettle full of crude oil,crude oil being a mixture of many different hydrocarbons,which all have their own different boiling points,so basically you heat up the crude oil and as the temperture rises,the hydrocarbons are released in order from lowest to highest of their given boiling points, so the first to go are the light gases ie ethane/methane,then the heavier gas,propane/butane,then the distillates,gasoline/diesoline,until your basically left with bitumen,which has the highest boiling point!...Jeeeezzz,i must be bored!! Anyway,hope this helps?
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