Topic: Thermodynamics
The pressure P of a gas in terms of its mean kinetic energy per unit volume E is equal to
- A. E/3
- B. E/2
- C. 3E/4
- D. 2E/3
Answer: D. 2E/3
Explanation: Kinetic energy for gas KE = (3/2)RT = (3/2)PV. Therefore, KE/V = (3/2)P = E, which means P = (2/3)E.