Answer: collisions.
- A collisions
- B containers
- C chemical reactions
- D phase changes
Correct answer: A. collisions
Explanation: Mean free path is the average distance between one collision and the next.
Not all gas molecules move at the same speed - the Maxwell-Boltzmann distribution shows the spread, with the most probable speed vp slightly less than the average vavg, which is slightly less than the root-mean-square speed vrms used in the pressure formula.
Concept context
Kinetic theory of gases connects molecular motion to pressure and temperature, explaining gas laws, specific heats, and molecular speeds.