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The average kinetic energy of the molecules does not change with time (as long as the temperature of the gas remains constant). The pressure of a gas is causes by collisions of the molecules with the walls of the container. Assumptions for Ideal Gas Theory The gas consist of a very large number of identical molecules, each with mass m but with negligible size (this assumption is approximately true when the distance between the molecules is large, compared to the size).
Assumptions for Ideal Gas Theory The molecules are moving in random directions with a distribution of speeds that is independent of direction. Pressure and Kinetic Energy Since the collision is elastic, the y - component of molecule’s velocity remains unchanged, while the x - component reverses sign. I would rather entertain and hope that people learned something than educate people and hope they were entertained.

Molecular Model of an Ideal Gas The model shows that the pressure that a gas exerts on the walls of its container. The consequence > for negligible size molecules we can neglect the intermolecular collisions.
Dividing by the wall area A then gives the force per unit area, or pressure: To get the total force on the wall, we sum over all N molecules. Find the average translational kinetic energy of an oxygen molecule under these conditions. Determine the final volume of the gas after 4.40 kJ of energy is transferred to the air by heat. In other words, if I have two gas samples, both at the same temperature, then the average kinetic energy for the collection of gas molecules in one sample is equal to the average kinetic energy for the collection of gas molecules in the other sample.

Collisions with the container walls are elastic, conserving the molecule’s energy and momentum. After colliding with the right hand wall, the x - component of molecule’s velocity will not change until it hits the left-hand wall and its x - velocity will again reverses.
This means there are no potential energy changes to be considered, so each molecules kinetic energy remains unchanged.

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