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You need liquid density ( kg per litre ) > Some example densities ( kg per litre) Water = 1.0 Petrol = 0.737 Beer = 1.01 Kerosene = 0.82 Paraffin = 0.8 > 1 US gallon = 3.7854 litres, then * density of liquid ( kg per litre ) = kgs or: 1 UK gallon = 4.5461 litres, then * density of liquid ( kg per litre ) = kgs
A "litre" can weigh different amounts depending on what the litre is comprised of. For example, a litre of water will weigh more than a litre of chocolate mousse (more air in the mousse, but I admit the example's odd)... If you then dissolve a lot of sugar in the litre of water, it will weigh more than it did previously (the volume will also increase a little, some will have to be poured out to retain "1 litre", but it will not weigh what it did originally). So it is not possible to know how much of a litre weighs a gram without knowing what substance the litre is comprised of.
A tonne is a measure of mass. A litre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid. If you are not convinced, consider a litre of air. How many tonnes? Next consider a litre of lead. How many tonnes? Some people still believe that there is a conversion in relation to water but that is only approximately true. Until 1964 a litre was defined as the volume of one kilogram of pure water at 4 deg Celsius and at a pressure of 760 millilitres of mercury. With that definition 250 grams of water (under those conditions) would have occupied 250 ml. But that definition of a litre was abandoned in favour of 1 litre =1000 cubic centimetres.
A kilogram is a unit of mass. A litre is a unit of capacity. Without some unit of density to convert, the two units are incompatible.
A kilogram is a unit of mass. A litre is a unit of capacity. Without some unit of density to convert, the two units are therefore incompatible.