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I'm no Chemical/liquid scientist, but I weighed a gallon of Poland Spring water today and the scale read 8.5 pounds. The Plastic container must not even tip the scales at an ounce or so.
I've always heard that Gasoline weighs 6.5 pounds. Are they both different in weight because of their molecular structures?

I think race gas is around 6.25 lbs per gallon(7.40 density) , airplane 100 Low Lead is around 6.0 lbs per gallon(5.90) and pump gas in probally close to race gas weight, 7.0 to 7.3 in a gasoline hydrometer I think the U.S.Army use to use 8.5 lbs per gallon of water minus the container weight when figuring what weights you where going to to tote on your back in combat conditions

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)