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1 liter of water weighs in at 1 kilogram (kg), so 0.5 liters would likely weigh in at 0.5 kg.

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The above is only approximately true and that for pure water under very controlled conditions. It is certainly not true for most other fluids whjose volume may be measured in litres.

Some people still believe that there is a 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 millimetres of Mercury. With that definition a conversion would have been valid - but only for pure water and only under those conditions. In any case that definition of a litre was abandoned in favour of 1 litre =1000 cubic centimetres.

In fact the density of pure water, at 4 deg C and 760 ml of mercury is 0.9999720 kg/litre.

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12y ago

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