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Mass stays the same on Earth, in space, or on the Moon. WEIGHT varies, because weight is the mass times the gravity. On Earth, we're often guilty of lazy speech and lazy thinking, and we sometimes use "mass" and "weight" interchangeably. This is convenient here on Earth, where the force of gravity is pretty much the same everywhere. (There are very minor differences due to changes in altitude or mass concentrations in the Earth, but the differences are unnoticeable without precise instruments.)

So one kilogram is a measurement of MASS; 2.2 pounds is a measurement of WEIGHT. They are not the same.

In the metric system, mass is measured in grams, while weight is measured in newtons. In the English system (used in the USA, but no longer in England) mass is measured in "slugs" while weight is measured in pounds.

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10y ago

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