Rise of fluid in capillary when placed in fluid - Fluid Mechanics

Q.  The fluid will rise in capillary when the capillary is placed in fluid, if
- Published on 04 Aug 15

a. the adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules
b. the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules
c. the adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules
d. cannot say

ANSWER: the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules

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    Discussion

  • Pankaj   -Posted on 25 Sep 15
    When a small diameter tube is inserted vertically inside a liquid pool, the liquid level in the tube either falls or rises according to the liquid level in the pool. This phenomenon of rise or fall of liquid level in the capillary tube is called as capillarity.
    If the adhesion force between molecules of liquid and tube is more than the cohesion force between liquid molecules the liquid will wet the glass surface and the liquid level will rise and vice versa. In the case of rise of liquid level, the liquid level becomes concave upward.

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