Give reasons (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container.
(a) A gas fills the vessel in which it is kept. Gas fills the vessel in which it is kept. Reason: Gases have a negligible intermolecular force of attraction between the particles of gas. As a result, the random motion of particles in all directions is experiencing in the vessel. Hence, the gas fills the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction to move constantly moving with high speed in all directions. Due to this intense random motion of particles, the particles hit each other and hit the container walls with force. These collisions of the gas particles with the container walls exert pressure on the walls of the container.
