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The amount of matter contained in an object and a physical measure of inertia. Mass is measured in units called grams, and one gram is equal to the mass of one cubic centimeter of water at 4 degrees Celsius. Newton's Third Law states that mass is equal to the ratio of force to acceleration. Furthermore, Einstein's Theory of General Relativity states that mass and space are related, because mass warps space and space directs the motion of mass.