1.

State the expression for the angle of contact in terms of interfacial tensions?

Answer»

cos θ = \(\frac{T_2-T_1}{T_3}\), where θ is the angle of contact for a liquid-solid pair, T1 is the liquid-solid interfacial tension, T2 is the solid-gas (air + vapour) inter-facial tension and T3 is the liquid-gas interfacial tension.



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