Question

in case of angle of contact is obtuse then free surface of liquud in capillary tube is .​

Answer 1

Answer: Science > Physics > Surface Tension > Angle of Contact

When the liquid surface is curved concave upwards, the angle of contact is acute and when the liquid surface is curved convex upwards, the angle of contact is obtuse.

Explanation:

Answer 2

In case of angle of contact is obtuse then free surface of liquid in capillary tube is cohesive.

• When the free surface of a liquid comes in contact of a solid, it becomes curved near the place of contact.
• The angle inside the liquid between the tangent to the solid surface and the tangent to the liquid surface at a point of contact is known as the 'angle of contact'.

• The angle of contact is acute when the adhesive forces between the molecules of the liquid are far greater than the adhesive forces between the liquid molecules and the capillary tube.

• The angle of contact is obtuse when the cohesive forces between the molecules of the liquid are far greater than the adhesive forces between the liquid molecules and the capillary tube.