PPT Slide

• At the same T, different  gases have the same  average KE.

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• Molecules with a higher  mass have a lower  average speed.

• At the same T, O2 molecules are slower, on average, than He  molecules, but both hit the walls with the same average KE,  giving the same P.

Concept 5-11. The relations among mean free path,  molecular speed, and collision frequency

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