First slide

Surface tension and surface energy

Question

The liquid meniscus in capillary tube will be convex, if the angle of contact is

Moderate

A

Greater than 90°
B

Less than 90°
C

Equal to 90°
D

Equal to 0°

Solution

A convex meniscus occurs when the particles in the liquid have a stronger attraction to each other(cohesion) than to the material of the container.
It occurs when mercury is placed in a glass capillary.
The types of meniscus are shown in the figure.
In a convex meniscus, the angle of contact is greater than 90∘, which is angle between tangent to the liquid surface and the capillary surface, inside the liquid.

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