What is gravimetry?

Gravimetry is like using a super-sensitive scale to figure out how heavy something is, but not just for toys or candy.

Imagine you have a bag of marbles and another one with fewer marbles. If you put them on a scale, the one with more marbles feels heavier. Gravimetry works in a similar way, but instead of marbles, it measures mass, how much stuff is in something, using gravity.

Gravimetry uses the pull of gravity, which is like an invisible rope that pulls everything toward Earth (or another planet). The more mass something has, the stronger this pull feels. Scientists use special tools to measure how strong this pull is, and from that, they can tell exactly how much mass is in a place, even if you can’t see it!

Think of it like figuring out how many marbles are in a bag without looking. Gravimetry helps scientists do that with rock, water, or even whole planets, giving them clues about what's hidden below the surface, just by measuring weight!