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Related to temporary hardness: Hardness of water
temporary hardness[′tem·pə‚rer·ē ′härd·nəs]
The portion of the total hardness of water that can be removed by boiling whereby the soluble calcium and magnesium bicarbonate are precipitated as insoluble carbonates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.