Which one of the following gives the triple point of water?
- A. Temperature 273.16 K and Pressure 1 Pa ✓
- B. Temperature 273.16 K and Pressure 6.11 \times 10^{-3} Pa
- C. Temperature 0 K and Pressure 10^{3} Pa
- D. Temperature 373 K and Pressure 6.11 \times 10^{-3} Pa
Correct Answer: A. Temperature 273.16 K and Pressure 1 Pa
Explanation
The triple point of water is the specific temperature and pressure at which the solid, liquid, and gas phases of water coexist in equilibrium. Its exact value is 273.16 K and 611.657 Pa (not 6.11 \times 10^{-3} Pa). Because the options provided incorrect pressure units/values, the question was dropped. Note: This question was dropped by UPSC.
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