Answer :


Figure showing heights of liquids in an U-Tube


Given:


Height of spirit column (h1) = 12.5 cm


Height of water column (h2) = 10.0 cm


Let P0 = Atmospheric pressure


ρ1 = density of the spirit


ρ2 = density of the water column


Pressure due to spirit column at B = P0 + ρ1gh1


Pressure due to water column at D = P0 + ρ2gh2


Pressure is equal at the points having the same height from the ground i.e. at points B and D.


P0 + ρ1gh1 = P0+ ρ2gh2


ρ1h1 = ρ2h2




We know that


Therefore specific gravity of spirit is 0.8.


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