What is a resistance thermometer? Give the method of measuring temperature with it.

Solution

Resistance thermometer is a thermometer, which determines the temperature by studying the variation in resistance of metal due to change in temperature.
Resistance of metals approximately increases linearly with temperature.
By every one-degree rise or fall in temperature, the resistance of conductor increases or decreases by some constant multiple value of resistance of zero degree centigrade.
∴ $space space space space space straight R subscript straight t space equals space straight R subscript straight o plus straight R subscript straight o αt$
$straight R subscript straight t minus straight R subscript straight o space equals space straight R subscript straight o αt$ ...(1)
When t = 100,
$straight R subscript 100 minus straight R subscript straight o space equals space straight R subscript straight o straight alpha left parenthesis 100 right parenthesis$ ...(2)
Dividing (1) by (2), we get
$space space space space space space space space space space space space straight t equals fraction numerator straight R subscript straight t minus straight R subscript straight o over denominator straight R subscript 100 minus straight R subscript straight o end fraction cross times 100$

Some More Questions From Mechanical Properties of Fluids Chapter

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Mechanical Properties Of Fluids

What is a resistance thermometer? Give the method of measuring temperature with it.

Some More Questions From Mechanical Properties of Fluids Chapter

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