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mass | mass unit | | The measure of the inertia of an object, determined by observing the acceleration when a known force is applied. The gravitational force acting on an object is found to be proportional to its mass, as is the gravitational force that it exerts on other objects. | | | | quantity | | |
physico chemical constant | | | | | changes in value are due solely to an increase in measurement accuracy or convention | | fundamental physical constant | | |
atomic mass constant | kg | 0.00000013 × 10-27 kg | One-twelfth the mean mass of an atom of carbon 12 (including the orbital electrons). | | 1.66053873 × 10-27 kg | mu | | 1961 | mass |