Mechanical Properties of Fluids

Question

Why does coating of glycerine over the glass window prevent raindrops from sticking to it?

Answer

The angle of contact of water with clean glass is less than 90° i.e., acute. Therefore, the water sticks with glass window. By coating the layer of glycerine over glass window, the angle of contact becomes greater than 90° and makes the glass window non-sticky. 

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