# When does a body floats in a liquid and why?

A body floats in a liquid when the body’s weight is equal to the weight of the liquid displaced.

• The density of the body’s material is less than or equal to the density of the liquid.
• When the body floats in neutral equilibrium, the body’s weight is equal to the weight of displaced liquid.
• The centre of gravity of the body and centre of gravity of the displaced liquid should be in one vertical line.

### Law of floatation

Archimedes, the Ancient Greek scientist, first stated the principle of floatation. According to him, all the objects placed in a liquid experience an upward force that allows the body to float if it displaces water with a weight equal to the body’s weight. This upward force is known as buoyant force, and the law is known as the law of buoyancy.

### Archimedes Principle

When a body is immersed partly or wholly in a liquid, there is an apparent loss in the body’s weight, which is equal to the weight of the liquid displaced by the body.