Figure 16.14 shows a simple barometer.
What is the region A?
b What keeps the mercury in the tube?
c What is the value of the atmospheric pressure being
shown by the barometer?
d What would happen to this reading if the barometer
were taken up a high mountain? Give a reason,
A
2 cm
74 cm
mercury
41 cm
1 cm
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Answer: (a) The region A is a vacuum.
(b) The pressure in the atmosphere keeps the mercury in the tube.
(c) value = 74cm
(d) Up a mountain the air pressure is low and so the barometer reading will go down. As height increases, height of mercury column will decreases.
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