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The pressure deficiency of held water in a capillary tube is termed as ____________

(a) Soil suction and suction pressure

(b) Negative pressure

(c) None of the mentioned

(d) All of the mentioned

The question was asked in an internship interview.

My enquiry is from Capillary Tension, Capillary Potential and Soil Suction in portion Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

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Correct answer is (a) Soil suction and suction pressure

For explanation I would say: As the water is decreased linearly in the tube due to the suction of soil mass. The pressure deficiency is also called as soil suction or suction pressure.

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