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Mass is the property of a solid shape quantifying its matter. It is measured through resistance to acceleration or as the magnitude of the gravitational force.

The base unit of mass is the kilogram.
At first, the kilogram was to be defined as the mass of a cubic decimetre of water. In 1889, the first General Conference on Weights and Measures ratified the prototype kilogram and defined the unit as a unit of mass equal to the mass of the prototype kilogram, which corresponds to a litre of pure water at 4°C.