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Can't say but you can try contact Mr. Sinha of mercantile marine department, Calcutta who is perhaps the only man who knows the answer

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Q: Why they chose 15 deg C in determining fuel oil density?
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What is the hydrometer density of diesel fuel reading?

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What is the relative density to water of fuel oil?

If Water = 1 - then Fuel Oil (Diesel) = 0.867 @60/60 Deg F


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Why do you have to measure the mass before determining the density?

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What is the density of water at 50 deg Fahrenheit?

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What is the mass in grams of 147 mL of ethanol?

The density of ethanol at 20 deg C and normal presure is 0.789 g/mL.So the mass of 147 mL is 147*0.789 = 116.0 grams (approx).The density of ethanol at 20 deg C and normal presure is 0.789 g/mL.So the mass of 147 mL is 147*0.789 = 116.0 grams (approx).The density of ethanol at 20 deg C and normal presure is 0.789 g/mL.So the mass of 147 mL is 147*0.789 = 116.0 grams (approx).The density of ethanol at 20 deg C and normal presure is 0.789 g/mL.So the mass of 147 mL is 147*0.789 = 116.0 grams (approx).