Question

A liquid thermometer uses the property of expansion of liquids.
A. True
B. False

Answer 1

Hint: Generally, that material is used in the liquid thermometer which has a high coefficient of expansion so as to know the slightest change in the temperature. In a liquid thermometer, generally mercury is used. Application of Property of expansion of liquids is asked in this question.

Complete answer:
Liquid thermometer uses mercury as its core material.
Mercury is the only metal which remains in the liquid state at the room temperature.
Thermometer is a substance that is used to know the slightest change in the temperature; this can be done using the property of expansion of liquids.
Now, since we have only one metal which is in liquid state at room temperature and also obeys the property of expansion of liquids which means it has a high coefficient of expansion that is why it is used in the thermometers.
And hence, we can also say that the thermometer uses the property of expansion of liquids.
Because the thermometer uses mercury which is in its liquid state and has the property of expansion of liquids.
Hence, we can say that the given statement in the question is correct.

So, the correct answer is “Option A”.

Additional Information:
Liquids have no definite shape, size or length. They expand themselves on heating by gaining energy from the temperature raised. In the periodic table which contains all the elements, only one metal is there which is present in liquid state at its room temperature and that metal is mercury.

Note:
Mercury is the only metal that is present in liquid state at room temperature. The thermometer has to measure the very small temperature difference which is only possible if the liquid having a high boiling point and high coefficient of expansion is used.