The terms "mass" and "weight" are often interchangeable in our everyday lives, but to scientists they mean different things.
Mass is a measure of how much matter it contains
Weight is a measure of the pull of GRAVITY between you and the planet you are standing on.
In science class today (page 426) we explored this concept.
Check out this site:
http://www.exploratorium.edu/ronh/weight/
*we weigh less on the moon, because the pull of gravity on the moon is 1/6 of Earth's gravity*
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