What is a triple point of water cell used for?

A triple point of water cell is specifically designed to provide a precise and repeatable temperature reference based on the unique physical properties of water. At the triple point, water exists simultaneously in three states: solid, liquid, and gas, at a specific temperature and pressure (0.01°C and 611.657 pascals). This state serves as a fundamental reference point in thermodynamics, making it essential for calibration standards in temperature measurement.

The cell thus allows for accurate sourcing of temperature for calibration of thermometers and other temperature measurement instruments. By utilizing the triple point of water, technicians can ensure that their measuring devices are calibrated to known and consistent temperature standards, promoting precision and reliability in measurements across various applications.