the upward force experienced by a body when partially or wholly immersed in a fluid is called upthrust or buoyant force
the phenomenon responsible for this force is called buoyancy
Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid.
comes form the Spanish word boyar meaning float
buoyant force =(density of liquid)(gravitational acceleration)(volume of liquid)
si unit- Newton
depends on density of the fluid,volume of the fluid and acceleration due to gravity
it is caused by difference in pressure acting on opposite side of an object immersed in a static fluid