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Question

The most commonly used thermometric substance is
  1. water
  2. alcohol
  3. steam
  4. mercury

A
water
B
steam
C
alcohol
D
mercury
Solution
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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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