Multiple choice

In a barometer, mercury is preferred over water because

  1. mercury is a good conductor of heat

  2. mercury is shining and therefore its level can be read easily

  3. mercury is available in pure form

  4. mercury has high density and low vapour pressure
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mercury is preferred because its high density allows for a much shorter tube compared to water, and its low vapour pressure prevents it from evaporating into the vacuum space.

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