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The difference in volume of a given mass of sand or other fine material in moist and dry conditions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The increase in the bulk volume of a quantity of a material in a moist condition over the volume of the same quantity dry; also called moisture expansion.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.