(a) The average $x$-velocity of molecules in a container of gas at rest is zero.

Name: (a) The average $x$-velocity of molecules in a container of gas at rest is zero.
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In a container of gas at rest, the molecules move in all directions randomly. The average $x$-velocity (or any directional velocity) across all molecules is zero because the motions in one direction cancel out the motions in the opposite direction.

(A) the Average xxx -Velocity of Molecules in a Container of Gas at Rest

(A) the Average $x$ -Velocity of Molecules in a Container of Gas at Rest