When you place a block of wood in a pail of water, the block displaces some of the water, and the water level goes up. If you could weigh the water that the wood displaces, you would find that its ...

There are two forces acting on the life jacket - its weight and the force of the water pushing ... Things that float are buoyant. If the weight is greater than the upthrust, it sinks.

In this installment of Hot Science we present three questions that may help you to better understand buoyancy. The first is a kind of warm-up question, dealing with general buoyancy principles.