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Heat — Science STD 7 — Question

Maharashtra BoardEnglish MediumSTD 7ScienceHeat2 Marks
Question
Why is mercury or alcohol used in a thermometer?
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Answer

Mercury is used in a thermometer because of the following properties.
Alcohol is used in a thermometer for the following properties.
  1. It can measure a low temperature because its freezing point is low. (-115°C) but it can not measure higher temperature as its boiling point is low.
  2. It can measure the temperature precisely because it has large expansion coefficient.
  3. It’s expansion is regular.
  4. Less hazardous.

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