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Air separated from the atmosphere by a c...

Air separated from the atmosphere by a column of mercury of length h = 15 cm is present in a narrow cylindrical two soldered at one end. When the tube is placed horizontally the air occupies a volume `V_(1)= 240 mm^(3),` When it is set vertically with its open end upwards the volume of the air is `V_(2)=200 mm^(3).` The atmospheric pressure during the experiment is 7n cm of Hg where n is single digit number. Find n.

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