- moderately hard
- средней твёрдости; средней жёсткости
English-Russian scientific dictionary. 2008.
English-Russian scientific dictionary. 2008.
Hard water — is the type of water that has high mineral content (in contrast with soft water ). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and… … Wikipedia
hard — [adj1] rocklike adamantine, callous, compact, compacted, compressed, concentrated, consolidated, dense, firm, hardened, impenetrable, indurate, indurated, inflexible, iron*, packed, rigid, rocky, set, solid, stiff, stony, strong, thick, tough,… … New thesaurus
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
Gmelina arborea — tree plantation Scientific classification Kingdom: Plantae … Wikipedia
Proof-of-work system — A Proof of work ( POW ) system (or protocol, or function) is an economic measure to deter denial of service attacks and other service abuses such as spams on a network by requiring some work from the service requester, usually meaning processing… … Wikipedia
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
Microtome — A microtome used in microscopy. A microtome (from the Greek mikros, meaning small , and temnein, meaning to cut ) is a sectioning instrument that allows for the cutting of extremely thin slices of material, known as sections. Microtomes are an… … Wikipedia
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
Pinus nigra — European Black Pine Pinus nigra Pinus nigra subsp. nigra, Bulgaria Conservation status … Wikipedia
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