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 ?
A mold strength tester can be used in much the same manner as a hardness tester, but it can be more definitive on harder molds (more than 92 mold hardness) than the C hardness tester.
Operation with hardness tester is as follows: at portable mode probe is pressed manually through mounting base 7 on tested material 4, at laboratory working mode, tested material 4 is pressed onto the base 7 until there is a pronounced strength.
Another principle for portable hardness testers is the rebound method.
The hardness tester is meant to determine all types of static stress hardness tests as well as of impact ones wherein impact hardness IH is expressed by the ratio between recoil kinetic energy [E.
The firmware of the hardness tester was then redesigned to automatically carry out both user defined and ISO 642, ASTM A255 Jominy standard test cycles.
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.
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.
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.
The solution is to take the hardness tester to the forging rather than the other way around," says Ed Nisbett, an independent consultant who is chairman of Subcommittee A01.
The laboratory will include an electronic universal sand strength machine, a digital absolute permmeter, a rapid sand washer, a digital ultrasonic cleaner, a sand rammer, a methylene blue clay tester, an electronic mold hardness tester, a laboratory sifter and a drying oven.