FLUID DISPLACEMENT
In fluid mechanics, displacement takes place when an physical object is immersed in a liquid, pushing it out of the way and taking its place. The volume of the fluid displaced can then be quantified (measured), and from this the volume of the immersed object can be deducted (the volume of the immersed object will be precisely equal to the volume of the displaced fluid).
An physical object that sinks dislocates an quantity of fluid equal to the physical object volume. Therefore buoyancy is expressed by Archimedes’ Principle, which says that the weight of the physical object is reduced by its volume multiplied by the density of the fluid. If the weight of the physical object is less than this displaced quantity, the physical object floats; if more, it sinks. The quantity of fluid displaced is directly related (via Archimedes’ Principle) to its weight.
In physics, buoyancy is the upward force that keeps things afloat. The net upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body. This force enables the object to float or at least seem lighter.
Fluid displacement
In the instance of an physical object that sinks (is entirely submerged), the volume of the physical object is displaced. In the instance of an physical object that floats, the quantity of fluid displaced will be equal in weight to the displacing object.
In conclusion, fluid displacement is how much fluid is pushed away when an object is placed in it.