Somebody said they are different because of gravity.
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Mass is the amount of matter in something. The more of it, the more force it takes to get it moving.
Weight is the force of gravity acting on an object.
If you change gravity (because you’re on the moon, perhaps), the same amount of matter (mass) will weigh more or less (like on the moon).
Weight is the mass of something times how fast it accelerates due to gravity.
Strictly, we measure mass in grams or slugs, and weight in Newtons or pounds. However, in our daily lives, gravity is pretty constant so we use grams for weight and pounds for mass without distinguishing between mass and weight.
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