hard water

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hard wa·ter

water containing ions, such as Mg2+ and Ca2+, that form insoluble salts with fatty acids so that ordinary soap will not lather in it.

hard water

Etymology: AS, heard + waeter
water that contains certain cations, particularly calcium and magnesium, that precipitate with soap solutions. The term is generally applied to tap water, and the degree of hardness varies with the source and previous treatment.
Water with a high content of calcium and magnesium salts—e.g., carbonates and sulphates—which may interfere with certain lab tests

hard water

Water with a high content of calcium and magnesium salts–eg, carbonates and sulfates, which may interfere with certain lab tests. See Mineral water, Spring water; Cf Soft water.

hard wa·ter

(hahrd wawtĕr)
That containing ions, such as Mg2+ and Ca2+, which form insoluble salts with fatty acids so that ordinary soap will not lather in it.
References in periodicals archive ?
Procedure: Press the base of the hardness tester firmly against the end of a standard 2 X 2-in.
and Ireland for: BAREISS GmbH of Germany who produce SHORE & IRHD hardness testers to test rubber, plastic, elastomer and silicone materials including O'rings, abrasion testers, resilience elasticity testers, and materials testers for other applications.
In contrast to traditional hardness testers, instrumented indentation systems allow the application of a specified force or displacement history, such that force, P, and the displacement, h, are controlled and/or measured simultaneously and continuously over a complete loading cycle.
Other products added In the following years, the company kept adding advanced products to its portfolio, such as the Canin Corrosion Analysing Instrument, the Profoscope Rebar Detector and Covermeter, the SilverSchmidt Concrete Test Hammer and the PaperSchmidt Roll Hardness Tester.
The DigiTest II automatic motorized hardness testing system is said to be one of the most impressive durometer/IRHD hardness testers on the market, and its modular design makes it suitable to virtually every durometer/IRHD measurement scale for testing various polymers.
Also for hardness determination and other important characteristics of material Martens hardness tester (DIN EN ISO 14.
This DigiChamber consists of a hardness tester and a temperature chamber that can carry out tests on a sample or by analyzing three different positions simultaneously, allowing companies to conduct more rigorous tests and ensure greater consistency across products.
Krautkramer's new "DynaPocket" is a small, compact rebound hardness tester conforming to ASTM Standard A956-00.
Instron introduced several new Wilson hardness testers: the Tukon 2100 Microhardness Tester and Wilson Series 2000 Rockwell Hardness Tester with closed-loop, load control designs; the Wilson MicroRockwell Hardness Tester designed for high speed production testing of small or thin components; and the M-200A and M-250A, compact, light weight testers.
Also, Barber-Colman now offers individually certified test disks for its Impressor hand-held hardness tester, allowing users to keep these testers calibrated in-house.