On the Kelvin meter, one of the calibration points is described to be at a temperature zero, where the thermometric property also has a magnitude of zero.
When T(X) = Ax
If XT and Xtr be the value of the thermometric property calculated at unknown temperature T and triple point of water (273.16K), then
T = aXT Ttr = aXtr
Dividing, T/Ttr = XT/Xtr ∴ Ttr = 273.16K
∴
Temperature on fixed volume gas scale,
Temperature on fixed pressure gas scale,
Temperature on resistance scale,
TRIPLE POINT: It is the position at which the pressure and temperature are such that the solid, liquid and vapour phase of the substance may coexist in equilibrium.
For water triple point happens at 273. 16K
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