01 / 5 · Mark Rober
Buoyancy force has nothing to do with the density of the object, just the volume.
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And if your buoyancy force happens to be less than the force from gravity, you sink.
If you remember your lessons on buoyancy, you know that a ship displaces its own weight in water.
The turbulence of the hydraulic jump entrains a lot of air, reducing the buoyancy of a swimmer.
Even the moon joined in on the operation, raising the tide in the canal to give a little more buoyancy to the foundered ship.
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