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Liquid in a capillary rises to a height h. What column of liquid will remain in the capillary, if it is filled in a horizontal position and then placed in a vertical position? Assume the capillary to be sufficiently long. |
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Answer» Solution :When the FLUID reaches the lower end of the tube, a convex meniscus will be FORMED there with a shape identical to that of the UPPER meniscus (Fig. 21.7). The EXCESS pressure is `DELTA mu=2xx2 sigma //r` ]. But `2 sigma//r=rho g, h` `Deltap=rho gH`, from which H=2h. 
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