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Question
The reading on a differential manometer containing mercury (specific gravity = 13.6) is 25 cm. If mercury is replaced with water, the reading on differential manometer would be
A.
3.15 m
B.
3.4 m
C.
34 m
D.
31.5 cm
Answer ( Option B)

3.4 m

Solution

As the pressure is same
Pwater = Pmercury
rwghw  = rmercuryghmercury
rw × g ×Δhw = 13.6 rw × g ×Δhmercury
Δhw = 13.6 × 25 = 340 cm = 3.4 m
 

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