A block of wood made of oak, for example, sits deeper in the water ... If you could somehow keep increasing the density of the block, it would sink lower and lower into the water.

Buoyancy* (1985) is a 15-minute educational film produced by Coronet Film and Video that explores the fundamental principles ...

The answer lies in a scientific principle called buoyancy, discovered by the ancient ... This makes the ship’s overall density (mass per volume) less than the density of water.

Save guides, add subjects and pick up where you left off with your BBC account. There are two forces acting on the life jacket - its weight and the force of the water pushing upwards on it - the ...