Mass is a measure of how much “stuff” something has.
Weight is a measure of how much *force* gravity is exerting on the “stuff”.
If you got on a rocket and flew to the moon, your *mass* wouldn’t change; you’re still made up of the same amount of stuff. But your *weight* would decrease, because gravity on the mood is weaker than it is on the earth.
Density is a measure of how much “stuff” something has compared to it’s volume. If we blow up a balloon, the amount of “stuff” that makes up the balloon doesn’t change, but the *volume of space* that stuff occupies changes. Objects with low density have a big physical size, but not as much “stuff” and objects with higher density.
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