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A narrow glass tube, 80 cm long and opens at both ends, is half immersed in mercury, now the top of the tube is closed and is taken out of mercury. A column of mercury 20 cm long remains in the tube. Find atmospheric pressure
When the glass tube is half dipped in mercury, pressure on top of mercury should be equal to the mercury pressure. Pressure is P1= 13.6 g (40)After taking the tube out the pressure of mercury + 1 would be the atmospheric pressure. Atmospheric pressure = P1 + 13.6 g (20) = 13.6 g (40) +13.6 g (20)Therefore the Atmospheric pressure would be 60cm of Hg column.
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