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A glass tube 80cm 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 20cm long then remains in the tube. The atmospheric pressure in hg is. please give detailed solution. Thank you.?
Verified Answer
A glass tube 80cm long and open at both ends is half immersed in mercu...
The atmospheric pressure will be equal to 60cm of mercury column.
Step-by-step explanation:

when we have half the tube is immersed in the mercury i.e 40 cm, the air pressure(P) inside the tube should be equal to the mercury pressure in the other half.
hence P =  ρgh = ρg40 
Once the tube is removed with upper end closed, the air pressure inside will remain same. Now since the other end is open, this air pressure + the pressure of mercury remaining = the atmospheric pressure at the other end.

Hence atmospheric pressure will be equal to pressure of 60cm of mercury column.
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A glass tube 80cm 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 20cm long then remains in the tube. The atmospheric pressure in hg is. please give detailed solution. Thank you.?
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