If the surface tension of a liquid is above the critical surface tension of a su

Question

If the surface tension of a liquid is above the critical surface tension of a surface, the liquid will

Spread on the surface

Will not spread on the surface

Will form a monolayer

Will spread only when the temperature is lowered

The force balance when a drop of a liquid is placed on a solid surface making a certain contact angle is governed by

Laplace equation

Fowkes equation

Young's equation

Gibbs equation

Spread on the surface

Will not spread on the surface

Will form a monolayer

Will spread only when the temperature is lowered

Explanation / Answer

Ans 1 : b) will not spread on the surface

When the surface tension of the liquid is above the critical surface tension of the surface, the liquid does not spread on the surface spontsaneously. The surface forces help teh liquid to spread on the surface , other forces such as gravitational force can cause the liquid to spread.

Ans 2 : c) Young's equation

The contact angle between the liquid and the solid surface is determined by the Young's equation. It helps us to quantify the wettability of the solid surface by liquid.

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