Final answer:
According to the kinetic molecular theory, gas pressure in a container decreases when the temperature of the gas decreases.
Step-by-step explanation:
According to the kinetic molecular theory, the pressure of a gas in a container will decrease if the temperature of the gas decreases. This is because a lower temperature means the average kinetic energy of the gas molecules is reduced, leading to less forceful and less frequent collisions with the walls of the container. Contrary to this, an increase in the number of moles of gas, a decrease in the volume of the container, or an increase in the number of collisions with the container wall would all lead to an increase in pressure.