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The specific gravity of ethanol is 0.794. This is for pure 100% ethanol. Specific gravity is the ratio of the density of a substance compared to the density of water. For example, water weighs 8.33 lb/gal at standard conditions (60 deg F). Ethanol weighs 6.61 lb/gal at standard conditions (60 deg F). Therefore, the specific gravity of ethanol is 6.61 divided by 8.33, equals 0.794.

A person can verify this result (0.794) by very fundamental experimental testing. Get a gallon of pure water and weigh it precisely. THIS will yield the number 8.33 lbs. Then do the same for ethanol; weigh a gallon of pure ethanol. This will yield the number 6.61 lbs. VOILA! 6.61 divided by 8.33 equals 0.794.

I did NOT actually do this weighing of the two liquids, but I COULD! I instead looked the values up in a standard reference book. My copy of "The Data Book on Hydrocarbons", also commonly referred to as 'the Maxwell data book', is a very familiar book to any one who works around the oil industry, as I did for 38 years.

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Q: What is the specific gravity of ethanol?

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The 1000 grammes of ethanol will occupy a greater volume because its specific gravity is lower than that of water. s.g. water = ~1.0 s.g. ethanol = ~ 0.794

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