First slide

Thermometry

Question

To measure a temperature say around 400°C which of the following thermometers can be used most conveniently :
(i) gas thermometer
(ii) mercury thermometer
(iii) platinum thermometer
(iv) thermocouple

Easy

A

(i, ii)
B

(i, iii)
C

(ii, iv)
D

(iii, iv)

Solution

gas thermometer - small temperatures.
mercury thermometer - < $200^{0} C$
platinum thermometer $200^{0} C t o 1000^{0} C .$
thermocouple thermometer $- 200^{0} C t o 2500^{0} C$

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