In physics, mass is a property of a physical body. It is generally a measure of an object's resistance to changing its state of motion when a force is applied. It is determined by the strength of its mutual gravitational attraction to other bodies, its resistance to acceleration or directional changes, and in the theory of relativity gives the mass–energy content of a system. The SI unit of mass is the kilogram (kg).
近义、反义、联想词
近义词
n.
fundamental quantity, fundamental measure, physical property, large indefinite quantity, large indefinite amount, collection, aggregation