He discovered it.
The concept of displacement in physics was developed by the ancient Greek mathematician and scientist Archimedes. He is credited with defining the principle of displacement while studying buoyancy and fluid mechanics.
Displacement.
They are both the same. displacement method is another name for Archimedes' principle
Archimedes stated that the mass of liquid displaced by a floating body equalled the mass of that body. One can deduce from this that if the displacement is less than the mass of a body then that body will sink.
Archimedes
Yes
Archimedes is credited as one of the first scientists to observe displacement, particularly in his famous bath experiment where he discovered the principle of buoyancy.
If you are talking about water displacement, it is the Greek philosopher Archimedes who is credited with that.
Archimedes was generally considerd to be the great mathmaticians of antiquity he spend his most of the time in Egypt where he invited the machine called Archimedes screw he was born in Greek in 365 BC
Archimedes discovered the concept of gravity with his levers and pulleys, his theory of displacement and invented the screw.
Archimedes
Yes, plasticine floating is related to water displacement. When plasticine floats on water, it is displacing an amount of water equal to its own weight, in accordance with Archimedes' principle. The buoyant force acting on the plasticine is greater than its weight, causing it to float.