magnesium hardness of water
51nitrogen group element — ▪ chemical elements Introduction any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …
52geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …
53Caesium — xenon ← caesium → barium Rb ↑ Cs ↓ Fr …
54Boron — (pronEng|ˈbɔərɒn) is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron is never found as a free element on… …
55Serpentine group — The serpentine group describes a group of common rock forming hydrous magnesium iron phyllosilicate ((magnesium, iron)3silicon|2oxygen|5hydroxide|4) minerals; they may contain minor amounts of other elements including chromium, manganese, cobalt… …
56Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… …
57DGH — Degrees of General Hardness (dGH) is a unit of water hardness, specifically of General Hardness.General Hardness is a measure for the number of calcium and magnesium cations per volume of water. 1 dGH corresponds to 10 mg of calcium oxide or… …
58pyroxene — pyroxenic /puy rok sen ik/, adj. /puy rok seen, peuh , puy rok seen /, n. any of a very common group of minerals of many varieties, silicates of magnesium, iron, calcium, and other elements, occurring as important constituents of many kinds of… …
59Marine aquarium — See also: Reef aquarium A marine aquarium …
60Industrial wastewater treatment — covers the mechanisms and processes used to treat waters that have been contaminated in some way by anthropogenic industrial or commercial activities prior to its release into the environment or its re use.Most industries produce some wet waste… …
