In a closed container ,the gas molecules have a highly random motion. Yet the pressure throughout the container is uniform at constant temperature.

Explanation

The number of gas molecules in a container is extremely large. For example `1 cm^3` of a gas contain nearly `10^20` molecules. So, the individual behaviour of the molecules are no larger important, rather , the gross statistical behaviour dominates. On every unit area anywhere on the wall, the number of collisions of molcules per second , the velocity of impact etc., are all equal on the average . The value of the mean velocity does not change if the temperature remains constant. So the pressure remains uniform, as long as the temperature of the gas remain the same.