2. Practical implementation of fixed points
To illustrate the uncertainty components that will be developed later, the practical realization of three fixed points is described below. The BIPM website contains a wide range of documents dealing with the realization of fixed temperature points.
2.1 Triple point of water (0.01°C)
The phase diagram for water is shown in figure 3 . Point A corresponds to the triple point; all three phases coexist. Temperature and pressure are fixed and cannot take on other values. Point B corresponds to the melting point (from solid to liquid) or freezing point (from liquid to solid) at normal atmospheric pressure (101,325 Pa). Two phases are present, and the temperature of the water-ice mixture...
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Practical implementation of fixed points
Uncertainties affecting the realization of fixed points
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