2.2 General Theory of Thermometry
We have seen that the thermometric property depends on the temperature, and working of all types of thermometers is based on this principle.
Specifying the thermometric property by X, its variation with temperature (t) is generally represented by
where Xt = value of the thermometric property at t degree
X0 = value of the thermometric property at zero degree
α, β and γ are constants of a thermometric substance which are of rapidly decreasing order of magnitude. So, we may take
and
or
or
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