Temperature 273.16 K and Pressure 611 Pa
The triple point of water is a fundamental concept in thermodynamics and it represents the unique set of conditions at which water can coexist in its solid, liquid, and gaseous phases simultaneously. This is a specific and well-defined point, both in terms of temperature and pressure.
Let's analyze the given options:
- Temperature 273.16 K and Pressure 1 Pa: Although the temperature is correct, the pressure is too low. The standard pressure at the triple point is much higher.
- Temperature 273.16 K and Pressure 611 Pa: This is the scientifically accepted value for the triple point of water. At 273.16 K and 611 Pa, water can simultaneously exist in the solid, liquid, and vapor phases.
- Temperature 0 K and Pressure 103 Pa: Temperature of 0 K is absolute zero, where all molecular motion ceases. This cannot be the triple point of any substance.
- Temperature 373 K and Pressure 6.11 x 10-3 Pa: This temperature is equivalent to the boiling point of water at 1 atmospheric pressure, not the triple point. 373 K is much higher than the triple point temperature.
Based on this analysis, the correct answer is: Temperature 273.16 K and Pressure 611 Pa.
This value is universally recognized in scientific and engineering contexts for the calibration of temperature measurement instruments, among other applications.
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