The total force acting perpendicular on a given surface is called thrust.

Thrust acting upon a unit area is called pressure. Its S.I. unit is Pascal denoted by ‘P’

Thus, pressure =Thrust/Area of contact

Archimedes’ principle states that when a body is immersed partially or fully in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.

Archimedes' Principle is used in designing ships and submarines. The Lacto meters and hydrometers used for measuring the purity of a sample of milk and for determining the density of the liquids are based on this principle.

Buoyancy can be defined as the tendency of the fluid to exert an upward force on an object, which is wholly or partially immersed in a fluid.

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