*World of Physics*. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.

This section contains 678 words(approx. 3 pages at 300 words per page) |

The principle of buoyancy is called Archimedes's Principle, since it was discovered by this Greek mathematician in the third century B.C. The principle states that the buoyant **force** acting on an object placed in a fluid is equal to the **weight** of the fluid displaced by the object. An object completely immersed in a fluid (liquid or gas) displaces a volume of fluid exactly equal to the volume of the object. The weight of that volume of displaced fluid is the buoyant force acting on the object.

**Fluids** such as water or air exert **pressure** in all directions and the amount of pressure depends on the depth of the fluid. The pressure on the bottom of an object immersed in a fluid will be greater than the pressure on the top of the object. The imbalance of pressure acting on the object creates an upward force...

This section contains 678 words(approx. 3 pages at 300 words per page) |