Question

At low temperatures ................. type of thermometer is used.

A

mercury thermometer

B

water thermometer

C

alcohol thermometer

D

thermometers cannot be used

Medium

Solution

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Correct option is
C

alcohol thermometer

Alcohol thermometer.

Reason: 
  • Alcohol expands uniformly.
  • It has a low freezing point () therefore it is very suitable for the place where the temperature gets very low.
  • It is an easily available cheap liquid, which is safe to use.
  • Alcohol is cheaper than mercury, and if you break the thermometer, it is not toxic.

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