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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

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                 
 

Grade:12

1 Answers

Arun
25763 Points
3 years ago
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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