Final answer:
When the temperature of a gas is decreased at constant volume, the pressure of the gas decreases due to reduced kinetic energy and fewer collisions.
Explanation:
When the temperature of a fixed mass of gas at constant volume is decreased, the pressure of the gas decreases. This is explained by the fact that as the temperature drops, the average kinetic energy of gas particles decreases, leading to fewer and less forceful collisions with the container walls, thus resulting in lower pressure.
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