GIVEN STATEMENT:
Mercury has a tendency to get depressed in the glass tube. The atmospheric pressure would try to raise it from the depressed level.
HOW?? AND WHY??
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1 Answers
62This is because the net force has to be balanced.
At any point inside the tube, there will be low pressure.. (because there is no air!) only pressure will be due to vapor pressure of mercury..
This vapor pressure is generally neglected
Now at any point in the tube, the net force has to be zero.
There will be force (pressure) to to atmospheric pressure. Which will tend to balance the weight of mercury.
If there was aire inside the column, this would not have happend. (then capillary action would have taken place.. but that is a different story altogether :)
