Question

what is buoyancy or upthrust​

Answer 1

Answer:

Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column.

Answer 2

The upward force experienced by an object when it is immersed into a fluid is called buoyancy or buoyant force.