Answer: constant random.
- A constant random
- B completely stationary
- C purely circular
- D fixed vibrational
Correct answer: A. constant random
Explanation: Gas molecules move continuously and randomly in all directions.
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.