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(C) In a gas,molecules move randomly in all directions in three-dimensional space. The velocity vector of a molecule can be resolved into three mutual

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$n/6$

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(C) In a gas,molecules move randomly in all directions in three-dimensional space. The velocity vector of a molecule can be resolved into three mutually perpendicular components along the $x$,$y$,and $z$ axes. Statistically,the molecules are distributed equally among these directions. For any one specific axis (e.g.,the positive $x$-direction),the fraction of molecules moving in that direction is $1/6$ of the total number of molecules $n$. Therefore,the average number of molecules moving in a fixed direction is $n/6$.

Consider a gas with $n$ molecules. The average number of molecules moving in a fixed direction is ..........

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