What is a fluid? Show that fluid exerts a thrust.

Explanation

Fluid is the mane given to a substance which begins to flow when external force is applied on it . When the fluid is kept in a container, the molicules of a fluid in random motion due to their thermal velocities are constantly collinding with the walls of the container and rebounding from them. They suffer a change in momentum. Due to it, they transfer some momentum to the wall. This mumentum transfered to the wall perunit time by the molecules of flluid ac counts for the thrust of liquid on the wall of the container.