J.R. S. answered 03/14/17
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1. The gas particles are in constant motion and in random straight line directions
2. Collisions between molecules does not result in interaction, but they merely bounce off each other
3. The observed pressure is a result of collision of gas molecules with the walls of the container
4. There is no loss of kinetic energy after collision with the walls of the container or after collision of molecules with each other. That is, collisions are elastic