Kilogram per cubic metre
The kilogram per cubic metre (symbol: kg·m, or kg/m) is the coherent SI derived unit of density, defined by mass in kilograms divided by volume in cubic metres. Relation to other measures. The density of water is about 1000 kg/m or 1 g/cm, because the size of the gram was originally based on the mass of a cubic centimetre of water. In chemistry, g/cm is more commonly used.