Question

Of the following thermometers, the one which can be used for measuring rapidly changing temperature is a :

A

Thermocouple thermometer

B

Gas thermometer

C

Platinum resistance thermometer

D

Vapour pressure thermometer

Easy

Solution

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Correct option is A)

Principle of thermometer:

The temperature of a substance can be measured by measuring 

(1) increase in volume of a gas on heating at constant pressure 

(2) increase in pressure of a gas on heating at constant volume 

(3) increase in resistance of a conductor on heating.


Gas thermometer, platinum resistance, thermometer, vapour pressure thermometers are not ideal for measuring changing temperatures.

Thermocouple Thermometer:

A thermocouple thermometer is formed by joining two dissimilar metals and kept at different temperatures and is ideal for measuring rapidly changing temperatures.

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