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Standard VII
Physics
Laboratory Thermometer
Question
At low temperatures ................. type of thermometer is used.
alcohol thermometer
mercury thermometer
water thermometer
thermometers cannot be used
A
mercury thermometer
B
alcohol thermometer
C
water thermometer
D
thermometers cannot be used
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Solution
Verified by Toppr
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.
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