2.7 Low and High Temperature Thermometry

The low temperature range is bounded by a limit 0°C, that is, 273 K and approach towards the limit of low temperature (see Fig. 2.6).


Sketch showing low temperature measurement


Fig. 2.6 Sketch showing low temperature measurement


First, we take the case of mercury thermometers. The lower range of a mercury thermometer is limited by the fact that it freezes at −38.87°C. So, temperature below −39°C cannot be measured by mercury thermometer. With alcohol thermometers which freeze at −111.8°C, temperature below the freezing point cannot be measured. But difficulty arises in the fact that the contractions of mercury and alcohol are not uniform ...

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