The diagram shows a
simple mercury
barometer.
Which height
is a measure of the
atmospheric
pressure?
Correct Answer: C
Explanation: A mercury barometer is a
traditional instrument widely used to measure air pressure. The simple
barometer above shows that the mercury level is up to point C. In fact, air
gives pressure on the surface of the mercury which pushes the mercury to go up
through the tube. The following figure will illustrate the atmospheric
pressure:
So, it’s clear from the above figure that height
of the mercury column which is C in the question is the correct answer.
