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What are the forces involved in hygroscopic water or contact moisture?

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in Geotechnical Engineering I by (102k points)
What are the forces involved in hygroscopic water or contact moisture?

(a) Adhesion force

(b) Capillary force

(c) All of the mentioned

(d) None of the mentioned

I got this question in an interview for internship.

My enquiry is from Modes of Occurrences of Water in Soil topic in portion Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

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Best answer
Correct answer is (a) Adhesion force

Explanation: In hygroscopic water, soil particle freely adsorbs water from the atmosphere by the physical force of attraction, and is held by adhesion force.

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