- 行业: Printing & publishing
- Number of terms: 178089
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- Company Profile:
McGraw Hill Financial, Inc. is an American publicly traded corporation headquartered in Rockefeller Center in New York City. Its primary areas of business are financial, publishing, and business services.
A technique for separating substances from a fluid substrate; the sample is placed in a capillary tube which is then subjected to a high-voltage current that separates its chemical constituents.
Industry:Chemistry
A form of gas chromatography in which the fixed phase (column packing) is a liquid solvent distributed on an inert solid support.
Industry:Chemistry
A highly efficient type of gas chromatography in which the gaseous sample passes through capillary tubes with internal diameters between 0.2 and 0.5 millimeter and lengths up to 100 meters, and adsorption takes place on a medium that is spread on the inner walls of these tubes.
Industry:Chemistry
An analytical technique for gases; the gas may be measured by instrumental methods or through chemical reactions with specific reagents.
Industry:Chemistry
MgF<sub>2</sub> White, fluorescent crystals; insoluble in water and alcohol, soluble in nitric acid; melts at 1263_C; used in ceramics and glass. Also known as magnesium flux.
Industry:Chemistry
SiF<sub>4</sub> A colorless, suffocating gas absorbed readily by water, in which it decomposes; boiling point,_86_C; used in chemical analysis and to make fluosilicic acid. Also known as silicon fluoride.
Industry:Chemistry
ZnBr<sub>2</sub> Water- and alcohol-soluble, white crystals that melt at 294_C; used in medicine, manufacture of rayon, and photography, and in a radiation viewing screen.
Industry:Chemistry
A binary compound of carbon with an element more electropositive than carbon; carbon-hydrogen compounds are excluded.
Industry:Chemistry
MgB<sub>2</sub> A crystalline intermetallic compound, produced as a black powder, that becomes superconducting at the unusually high temperature of 39 K (_389_F; _234_C); melts at 800 _C. Also known as magnesium boride.
Industry:Chemistry
SiCl<sub>4</sub> A clear, corrosive, fuming liquid with suffocating aroma; decomposes in water and alcohol; boils at 57.6_C; used in warfare smoke screens, to make ethyl silicate and silicones, and as a source of pure silicon and silica. Also known as silicon chloride; tetrachlorosilane.
Industry:Chemistry
