Final answer:
Decreasing the volume of a gas increases its pressure as gas molecules collide more frequently with the container walls.
Explanation:
Increasing the pressure of a gas can be achieved by decreasing the volume of the gas. When the volume of a gas is reduced, the gas molecules are confined to a smaller space, leading to more frequent collisions with the container walls, which results in increased pressure. For example, in a closed container, reducing the volume by half will double the pressure of the gas.
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