The grave (symbol: "gr") is a non-SI metric unit of mass that is equal to one kilogram. It is specifically used in the context of measuring the mass of a substance based on its volume, especially in the fields of physics and engineering. The grave is not commonly used in daily life or in scientific literature today, having been largely replaced by the kilogram as the standard unit of mass. The use of the grave may sometimes still be encountered in certain regional practices or historical contexts.
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