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Question

Draw a simple labelled diagram of a fortin barometer and state how it is used to measure the atmospheric pressure.

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Solution

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The leather cup is raised up or lowered down first to measure the atmospheric pressure. it is done using a screw S so that the ivory pointer I just touches the level of mercury in the glass vessel.
The point of use the mercury level in the barometer tube is observed using the main scale and the verniar scale.

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Answer the question:
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Which row states what happens to the pressure at point P and what happens to the level L ?

	Pressure at P	level L
A	decreases	falls
B	decreases	rises
C	stays the same	falls
D	stays the same	rises

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