Chemistry / Chem 0029 · Atom · ~20 seconds
Weight
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Weight is the force gravity exerts on an object's mass, changing wherever local gravity changes even though mass does not.
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An astronaut's mass on the Moon equals her mass on Earth, but her weight is far smaller because lunar gravity is weaker.
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Mass and weight are used interchangeably in speech; chemistry keeps them distinct because only mass stays constant when location changes.
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