Question

why it is so that we are able to move our hand freely in air but in water we need to exert more preassure? why?

Answer 1

Answer:

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The force acting per unit area on the walls of the container is called pressure. Thus, gases exert pressure. ... (d) In air, there is lot of empty space between the molecules and the forces between the particles are almost negligible. Hence, we can move our hand in air.

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Answer 2

Hi,

The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exerts pressure on the gas.