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The attraction of clay minerals with water is a surface phenomenon which is called absorption.

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in Casting-Forming-Welding I by (687k points)
The attraction of clay minerals with water is a surface phenomenon which is called absorption.

(a) True

(b) False

I got this question in an interview.

Enquiry is from Fire Clays, Illite and Kaolinite topic in division Molding and Core Sands of Casting-Forming-Welding I

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Right answer is (b) False

To explain: Clay minerals have the ability to attract water particles and this attraction is a surface phenomenon which is called as adsorption, which is completely different from absorption process because the ions and water molecules do not get inside the clay particles and they remained to adhere to the clay grains, that’s why the process is called as adsorption.

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