Question

What causes gas pressure (in terms of kinetic theory $?$

Answer 1

Hint : Gas pressure is caused by the collision of gas particles with each other and the walls of the container. The direction of this force is always perpendicular to the surface of the container.

Complete Step By Step Answer:
Based on the kinetic theory, pressure on the container walls can be quantitatively attributed to random collisions of molecules the average energy of which depends upon the gas temperature. During this molecular motion, they constantly collide with each other and with the walls of the container. The force of impact of a single collision is too small to measure. This large impact exerts a considerable force on the surface of the container. The sum of all these forces causes the pressure,$p$.the larger the number of collisions.
The gas pressure can therefore be related directly to temperature and density. Many other gross properties of the gas can be derived, such as viscosity, thermal and electrical conductivity, diffusion, heat capacity, and mobility. In order to explain observed deviations from perfect gas behavior, such as condensation, the assumptions must be appropriately modified. In doing so, considerable insight has been gained as to the nature of molecular dynamics and interactions. The direction of this force will be perpendicular to the surface of the container at every point.

Note :
The kinetic theory is based on the assumptions that the gas is composed of a large number of identical molecules moving in random directions, the molecules undergo perfectly elastic collisions with each other, and with the walls of the container, the transfer of kinetic energy between molecules is heat