Answer: zero.
- A zero
- B a maximum
- C infinite
- D constant
Correct answer: A. zero
Explanation: At 0 K molecular motion (and hence kinetic energy) theoretically ceases.
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.