Mass: Amount of material , SI (metric units) are kilograms, Is the same for an object everywhere in the universe, Is not a force, on the moon, this quantity is the same as on Earth, Weight: a measure of the force of gravity on an object, SI (metric units) is Newtons , dependent on gravitational pull, Is a force, if an object goes to the moon, this quantity changes, U.S. Customary units are pounds,

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