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A glass tube 80 cm long and open ends is...

A glass tube `80 cm` long and open 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 murcury `20 cm` long then remains in the tube. The atmospheric (in cm of Hg) is
(assume temperature to be constant )

A

20 cm of air column

B

60 cm of Hg column

C

60 cm of air column

D

20 cm of Hg column

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The correct Answer is:
B
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