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The "mass" is what is sometimes called (quite informally) the "amount of matter". To be a bit more precise, the mass is what gives an object inertia (the more mass an object has, the harder it is to change its velocity - read about "Newton's Second Law" for more details), as well as gravitational attraction (for example, on Earth, an object's weight is proportional to its mass).


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∙ 13y ago

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