Grave (unit)

The Grave ( French grave, according to the Latin gravitas, " heaviness ") is a not common base unit of mass. The unit symbol of the Grave is G.

The Grave was part of an on behalf of the French king, Louis XVI. developed system of units, which is the historical root of the International System of Units (SI) used today. 1793 Grave 1 was defined as the mass of one liter of water at 4 ° C. Already in 1795 it was replaced by the gram, until finally in 1799 the kilogram was introduced, which was defined as the mass of a cylinder of platinum ( the Urkilogramms, which should correspond to the mass of one liter of water at 4 ° C).

Consequently, equivalent to 1 Grave approximately one kilogram. The International Prototype Kilogram (which to this day the kilogram defined ), however, is ( slightly) heavier than 1 liter of water.