Question

A barometer tube reads 75cm of hg if tube is gradually inclined at an angle of

Answer 1

Given rhat a barometer tube reads 76 cm of mercury, when the tube is gradually inclined at an angle of 60° with vertical, keeping the open end immersed in the mercury reservoir, the angle of incineration with the horizontal will be

30

∘

and vertical will remain same as

76

c

m

as vertical height of mercury column represents the atmospheric pressure. If the length of mercury column be

L

cm in inclined condition then

76

L

=

sin

30

∘

=

1

2

Hence

L

=

152

c

m

. It is possible if the barometer tube is long enough to accommodate this elongation of the length of mercury column. .

But in actual practice the length of barometer tube is restricted to 100cm. So at the given inclination of tube this elongation will also be restricted to 100cm.

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