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(A) The angle of contact $	heta$ depends on the surface tension of the liquid,the surface tension of the solid-liquid interface,and the surface tensi

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decreases

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(A) The angle of contact $	heta$ depends on the surface tension of the liquid,the surface tension of the solid-liquid interface,and the surface tension of the solid-air interface,as given by Young's equation: $\cos 	heta = \frac{T_{sa} - T_{sl}}{T_{la}}$.When a soluble impurity is added to a liquid,it generally decreases the surface tension of the liquid $(T_{la})$.For most liquids that wet the surface (where $	heta Therefore,adding soluble impurities typically decreases the angle of contact.

By adding soluble impurity in a liquid,the angle of contact

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