A Glass Tube With One End Closed Is Opened And Inserted Downward Into The Mercury Tube, Sealing A Certain Mass Of Gas Inside, And The Mercury Surface in The Tube Is Lower Than The Tube
Jul 04, 2022
Because at the same depth h the water has the same pressure in all directions.
In the tube, depth H, pressure is P air,
Out of the tube, at depth H, the pressure is P0 plus Ph, so we get P gas is equal to P0 plus Ph.
This kind of problem is usually solved in a false way.
Let's say the difference is still h, and then out of the tube, h, the pressure is still P0 plus Ph, and inside the tube, the pressure is still P air, but because the air is smaller, the pressure is higher, so the air has to push the level down a little bit more. So: the final liquid level difference is greater than H.
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