Columbia Encyclopedia

Search results

472 results found

Gram's stain

(Encyclopedia)Gram's stain, laboratory staining technique that distinguishes between two groups of bacteria by the identification of differences in the structure of their cell walls. The Gram stain, named after its...

Seraing

(Encyclopedia)Seraing sərĕNˈ [key], city (1991 pop. 60,838), Liège prov., E Belgium, on the Meuse River, near Liège. It is a major center of heavy industry. Nearby is Val Saint Lambert, one of the world's lead...

de Gennes, Pierre-Gilles

(Encyclopedia)de Gennes, Pierre-Gilles, 1932–2007, French physicist, Ph.D. Center for Nuclear Studies at Saclay, France, 1958. He was a professor at the Univ. of Paris, Orsay, from 1961 to 1971, when he joined th...

gallium

(Encyclopedia)gallium gălˈēəm [key], metallic chemical element; symbol Ga; at. no. 31; at. wt. 69.723; m.p. 29.78℃; b.p. 2,403℃; sp. gr. 5.904 at 29.6℃ (solid), 6.095 at 29.8℃ (liquid); valence +2 or +3...

freezing

(Encyclopedia)freezing, change of a substance from the liquid to the solid state. The temperature at which freezing occurs for a pure crystalline solid is called the freezing point and is a characteristic of the pa...

Grove, Sir George

(Encyclopedia)Grove, Sir George, 1820–1900, English musicographer, whose Dictionary of Music and Musicians (1879–89) has become a standard reference work. Originally an engineer, he assisted in the establishmen...

Orrefors

(Encyclopedia)Orrefors ôrəfôrsˈ, –fôshˈ [key], town, Kronoberg co., SE Sweden. It is noted for the manufacture of fine crystal and glassware. Simon Gate and Edward Hald, who made Orrefors famous, were outst...

naphtha

(Encyclopedia)naphtha năpˈthə, năfˈ– [key], term usually restricted to a class of colorless, volatile, flammable liquid hydrocarbon mixtures. Obtained as one of the more volatile fractions in the fractional ...

deliquescence

(Encyclopedia)deliquescence dĕlˌəkwĕsˈəns [key], conversion of a solid substance into a liquid as a result of absorption of water vapor from the air. Since impurities in a solid lower its melting point, the a...

latent heat

(Encyclopedia)latent heat, heat change associated with a change of state or phase (see states of matter). Latent heat, also called heat of transformation, is the heat given up or absorbed by a unit mass of a substa...