At low temperatures ................. type of thermometer is used.
A
mercury thermometer
B
water thermometer
C
alcohol thermometer
D
thermometers cannot be used
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Solution
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Alcohol thermometer.
Reason:
Alcohol expands uniformly.
It has a low freezing point (−115oC) 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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