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- A measure of the force required to impart unitA particular measure of a physical quantity that is used to express the magnitude of the physical quantity; for example, the meter is the unit of the physical quantity, length. acceleration to an object; massA measure of the force required to impart unit acceleration to an object; mass is proportional to chemical amount, which represents the quantity of matter in an object. is proportional to chemical amount, which represents the quantity of matterAnything that occupies space and has mass; contrasted with energy. in an object.