Answer:
When temperature decreases, the average kinetic energy of particles in a gas decreases as well. As a result, the particles move more slowly and have less energy to exert force on their surroundings. This leads to a decrease in the frequency and force of particle collisions with the walls of a container. Pressure is the result of these particle collisions with the container walls, so with fewer and less energetic collisions, the pressure decreases. In summary, as temperature decreases, particle motion slows down, leading to fewer and less forceful collisions with the container walls, which results in a decrease in pressure.