The pressure exerted by a gas on the walls of its container occurs in all directions because gas molecules are in constant, random motion and collide with the container walls from all angles. These collisions transfer force to the walls, producing pressure uniformly in every direction. Key reasons include:

• Gas molecules move freely and randomly in all directions due to large intermolecular spaces and weak attractive forces between them.
• The molecules collide with the container walls from every possible direction, exerting force perpendicular to the walls.
• The uniform, random movement of a vast number of gas molecules results in a consistent pressure that acts equally in all directions.

Thus, the gas pressure is a consequence of the continuous, random, and multi- directional collisions of gas molecules with the container walls, making the pressure exerted isotropic, or equal in all directions.