Question

define the term buoyant force and buoyancy​

Answer 1

Answer: Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object. The buoyant force comes from the pressure exerted on the object by the fluid.

Explanation: The pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top - hence the net upward force. The buoyant force is present whether the object floats or sinks. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column. Similarly, the pressure at the bottom of an object submerged in a fluid is greater than at the top of the object. The pressure difference results in a net upward force on the object.