moderately hard

moderately hard
средней твёрдости; средней жёсткости

English-Russian scientific dictionary. 2008.

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  • hardness — water with a high mineral content, the name deriving from the fact that it is hard to develop a lather for cleaning. The concentration of calcium and magnesium ions in water is expressed as p.p.m. or mg/l of calcium carbonate equivalents. Soft… …   Dictionary of ichthyology

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  • magnetite — /mag ni tuyt /, n. a very common black iron oxide mineral, Fe3O4, that is strongly attracted by magnets: an important iron ore. [1850 55; MAGNET + ITE1; cf. G Magnetit] * * * or lodestone or magnetic iron ore Iron oxide mineral (Fe3O4), the chief …   Universalium

  • uraninite — /yoo ran euh nuyt , ray neuh /, n. a mineral, probably originally uranium dioxide, UO2, but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, and helium, occurring in several varieties, including pitchblende:… …   Universalium

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  • Cold water pitting of copper tube — occurs in only a minority of installations. Copper water tubes are usually guaranteed by the manufacturer against manufacturing defects for a period of 50 years. The vast majority of copper systems far exceed this time period but a small minority …   Wikipedia

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  • Hearing (person) — The term hearing or hearing person , from the perspective of mainstream English language culture, refers to someone whose sense of hearing is at the medical norm. From this point of view, someone who is not fully hearing has a hearing impairment… …   Wikipedia


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