The most commonly used thermometric substance is | Filo
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Class 7

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The most commonly used thermometric substance is

  1. water
  2. alcohol
  3. mercury
  4. steam
Correct Answer: Option(c)
Solution: Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures, and it doesn't stick to glass.
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