When a gas is inside the tube, the individual air molecules travel the length of the tube.
The individual particle of a gas element moving randomly inside the element structure.
When the gas contained in a container, the molecules move randomly inside it. According to the kinetic theory of gases, molecules travel the mean distance. The air molecules vibrates horizontally parallel to the length of the tube.
In an open tube, air molecules are distant from each other. So, they can travel the length of the tube.
Thus, individual air molecules travel the length of the tube.
Learn more about molecules.
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