Multiple choice

In a mercury barometer, when  air pressure increases, the mercury in the tube __________.

  1. rise

  2. fall

  3. stay the sane

  4. goes up and down at random
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a mercury barometer, increasing atmospheric pressure pushes down on the mercury reservoir, forcing more mercury up the glass tube. The height of the mercury column directly indicates air pressure. When pressure decreases, the mercury column falls. The 'stay the sane' option contains a typo for 'stay the same'.

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