Question

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

• A. mercury thermometer
• B. water thermometer
• C. alcohol thermometer
• D. thermometers cannot be used

Answer 1

Answer: (C)

alcohol thermometer

Alcohol thermometer.

Reason:

• Alcohol expands uniformly.
• It has a low freezing point ($-{115}^{o}C$) 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.