Question

Water gets depressed in a glass tube whose inner surface is coated with wax. Why ?​

Answer 1

Answer:

SINCE WATER DOES NOT WET PARAFFIN WAX

THEREFORE WATER IS DEPRESSED IN SUCH A TUBE

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Answer 2

Water is depressed in a glass tube whose inner surface is cotated with paraffin wax because of the fact that force of cohesion between molecules of water is larger than the force of adhesion between the moleculesa of water and wax. Therefore the water does not wet paraffin wax. The height upto which a liquid riese in a capillary tube is given by

h=2Scosθ/rρg

Since water does not wet paraffin wax. θ is obutuse (i.e., θ>90∘) , cosθ is negative. Hence h is -ve . therefore water is depressed in such a tube.

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