18 A glass tube 80 cm long and open at both ends is half immersed...
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Physics
18 A glass tube 80 cm long and open at both ends is half immersed in mercury Then the top of the tube is closed and it is taken out of the mercury A column of mercury 20 cm long then remains in the tube The atmospheric pressure in cm of Hg is assume temperature to be constant a 75 b 30 c 60 d 90
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