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# Consider a gas in a container which is made air tight. Now, there is a movable piston fitted with the container. The gas performs some mechanical work on the piston by moving it. The reason the gas performs its work is because of which of the following?

(A) The gas molecules have mass (B) The gas molecules have velocity (C) The gas molecules have momentum (D) The gas molecules have elasticity

Because the molecules posses $\textbf{momentum}$, they can transfer it to the piston after collision, which moves the piston.