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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Ans. 5
Sol. P = 
n = 5
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