Explain why the detergents should have small angle of contact.
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Since, Capillary rise = h = 2TCos/rPg i.e. h is directly dependent on θ (Angle of contact) Now If θ→ Small then Cos θ is large and if detergents should have smaller angle of contact then detergent will pentrate more in the cloth and clean better.
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Water with detergent dissolved in it has small angles of contact (θ). This is because for a smallθ, there is a fast capillary rise of the detergent in the cloth. The capillary rise of a liquid is directly proportional to the cosine of the angle of contact
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