A narrow glass tube, 80 cm long and opens at both ends, is half immersed in mercury, now the top of thetube is closed and is taken out of mercury. A column of mercury 20 cm long remains in the tube. Findatmospheric pressure (1) 20 cm of air column (2) 60 cm of Hg column (3) 60 cm of air column (4) 20 cm of Hg column

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