Question

capillary tube is dipped vertically in a liquid then the liquid surface is hemispherical then angle of contact theta is​

Answer 1

If the capillary tube is vertically dipped in a liquid at that time the liquid surface is hemispherical then the angle of contact theta is 90 degrees.

• The height h by which a liquid will rise upward in a capillary tube of internal radius r is specified by

         h= 2Scosθ/rρg

• Here S is the surface tension, ρ is the liquid density and θ is the angle of contact.

• If the level of liquid in and out of the tube are equal. Then We have cosθ=0, as other variables can't be zero.

                          cosθ=0

• so the contact θ would be 90 degrees.

Answer 2

Answer:

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