Question

Is the triple point of water exactly 0.01deg

C, or is this an empirical value/is there some uncertainty to it? If so, how do we know it is exact, and why?

Answer 1

The triple point of water is an exact value at 0.01°C and 0.00604 atm. It is used as a calibration temperature and represents a unique condition where all three phases of water coexist in equilibrium.

Step-by-step explanation:

The triple point of water is exactly 0.01°C (273.16 K) and 0.00604 atm (4.59 mmHg). The triple point of water is an exact value at 0.01°C and 0.00604 atm. It is used as a calibration temperature and represents a unique condition where all three phases of water coexist in equilibrium.

It is a more accurate calibration temperature than the melting point of water at 1.00 atm, which is 0.0°C (273.15 K). The triple point is a unique combination of temperature and pressure where all three phases of water (solid, liquid, and gas) coexist in equilibrium. It is a well-established and reproducible value used as a reference for temperature measurement.