“Weight” is caused by gravity acting on mass. For example, your weight on Earth might be 120 lbs., but in outer space, it’s 0. (And on the Moon, it’s 19.9 lbs. You may not want to know what your weight is on a neutron star, but check the link below.)
Buoyancy is something different, it’s about how things float. Buoyancy is the relation of a liquid to the thing that’s floating in it. You know the expression “floats like a rock”? That’s because rocks are denser than water: The heavy stuff goes straight to the bottom. On the other hand, while humans are mostly water, they’ve also got a certain amount of gas and other stuff. That’s just enough to allow humans to float in water: They are lighter.
What happens when people, for example, float in something even heavier than water, such as the the chemical Mercury? People float very high!
So with bouyancy, it’s the amount of difference between the density of the liquid and the thing that’s floating that counts.
So you’re prolly thinking then … wait a minute … if rocks sink, why don’t ocean liners? They’re huge and metal, right? It’s because of the huge air spaces inside the ocean liner. It’s that air that keeps the ship afloat. Ripe a hole in the side, letting the water in, and … hello Titanic!
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