Answer: 273.16 K and 611.7 Pa.
- A 0 degrees C and 1 atm
- B 273.16 K and 611.7 Pa
- C 100 degrees C and 0 Pa
- D 25 degrees C and 1 atm
Correct answer: B. 273.16 K and 611.7 Pa
Explanation: Triple point of water: T = 273.16 K (0.01 degrees C), P = 611.7 Pa. All three phases coexist.
The Carnot cycle alternates two isothermal steps (heat absorbed at TH, released at TC) with two adiabatic steps (no heat exchange); the enclosed loop area equals the net work output, and η = 1−TC/TH is the maximum possible efficiency between those two temperatures.
Concept context
Laws of thermodynamics, heat engines, entropy, and gas processes.