MAHE Manipal B.Sc Nursing 2025
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Rise of liquid in a capillary tube is considered one the most difficult concept.
22 Questions around this concept.
20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator, the length (in cm) of the water column in the capillary tube will be :
Capillarity -
If a capillary tube is dipped in a liquid, it is found that the liquid in the capillary either ascends or descends relative to the surrounding liquid. This phenomenon is called capillarity.
Examples of capillarity-
A towel soaks water.
Ascent Formula-
When one end of the capillary tube of radius r is immersed into a liquid of density (For example- water and capillary tube of glass), And the shape of the liquid meniscus in the tube becomes concave upwards as shown in the figure.
Then the height h up to which the liquid level rises in the capillary tube is given by Ascent Formula
which says
where
1. The capillary rise depends on the nature of liquid and solid both. I.e on
2. For a given liquid and solid pair as
3. Capillary action for various liquid-solid pair
I. For
So Meniscus will take Concave shape and liquid in the capillary will rise/ascend.
II. For
So Meniscus will take Convex shape and liquid in the capillary will fall/descend.
III. For
So Meniscus will take Plane shape and liquid in the capillary will show No rise, no fall.
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