One kilogramme is equal to one litre of water. While the weight of solids is typically measured in kilogrammes, the volume of water is recorded in litres. Containers are frequently used to store water, and the volume of a container is always expressed in litres.
There are 1,000 millilitres in a litre. 1,000 cubic centimetres are also equal to one millilitre. As a result, one millilitre is equivalent to one cubic centimetre.
In addition, 1 gramme is equivalent to 1 cubic centimetre. Water therefore weighs 1 gramme every millilitre or cubic centimetre. According to this, 1,000 grammes are equivalent to 1,000 millilitres of water. A kilogramme of water therefore weighs exactly one litre.