浮力 (fú lì): buoyancy

Wood can float on water because the water's buoyancy holds it up.

When swimming, you can feel the water's upward buoyancy on your body.

The Dead Sea has a very high salt content, so its buoyancy is especially strong, making it easy for people to float.

Submarines change their buoyancy by adjusting the amount of water in their tanks, thereby diving and surfacing.

The buoyancy acting on a hydrogen balloon is greater than its own weight, so it can fly up into the sky.