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Most people still believe that there is a 1-to-1 conversion in relation to pure water but that is only approximately true. Until 1964 (nearly 50 year ago!) a litre was defined as the volume of one kilogram of pure water at 4 degrees Celsius and at a pressure of 760 millilitres of Mercury. With that definition a conversion would have been valid - but only for pure water and only under those conditions. And, in those circumstances, the mass of 3 litres would have been 3 kilograms.

However, the density of pure water, at 4 deg C and 760 ml of mercury is 0.9999720 kg/litre so the mass of 3 litres of water would be 2.9999160 kilograms.

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12y ago

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Q: What is the mass of 3Liters of water?
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