Columbia Encyclopedia

Search results

302 results found

bromine

(Encyclopedia)bromine brōˈmēn, –mĭn [key] [Gr.,=stench], volatile, liquid chemical element; symbol Br; at. no. 35; at. wt. 79.904; m.p. –7.2℃; b.p. 58.78℃; sp. gr. of liquid 3.12 at 20℃; density of va...

copper, chemical element

(Encyclopedia)copper, metallic chemical element; symbol Cu [Lat. cuprum=copper]; at. no. 29; at. wt. 63.546; m.p. 1,083.4℃; b.p. 2,567℃; sp. gr. 8.96 at 20℃; valence +1 or +2. Copper and some of its alloys ha...

matrix

(Encyclopedia)matrix, in mathematics, a rectangular array of elements (e.g., numbers) considered as a single entity. A matrix is distinguished by the number of rows and columns it contains. The matrix CE5 is a 2...

Herzl, Theodor

(Encyclopedia)Herzl, Theodor tāˈōdôr hĕrˈtsəl [key], 1860–1904, Hungarian Jew, founder of modern Zionism. Sent to Paris as a correspondent for the Vienna Neue Frei Presse, he reported on the Dreyfus affair...

Greider, Carol Widney

(Encyclopedia)Greider, Carol Widney, 1961–, American molecular biologist, b. San Diego, Calif., Ph.D. Univ. of California, Berkeley, 1987. Greider was a researcher and professor at the Cold Spring Harbor Laborato...

isomorphism

(Encyclopedia)isomorphism īˌsəmôrˈfĭzəm [key], of minerals, similarity of crystal structure between two or more distinct substances. Sodium nitrate and calcium sulfate are isomorphous, as are the sulfates of...

pyridine

(Encyclopedia)pyridine ăzˈēn [key], C5H5N, colorless, flammable, toxic liquid with a putrid odor. It melts at −42℃ and boils at 115.5℃. Chemically, it is a heterocyclic aromatic tertiary amine (see under a...

peroxide

(Encyclopedia)peroxide pərŏkˈsīd [key], chemical compound containing two oxygen atoms, each of which is bonded to the other and to a radical or some element other than oxygen; e.g., in hydrogen peroxide, H2O2, ...

Bush, John Ellis ("Jeb")

(Encyclopedia) Bush, John Ellis ("Jeb"), 1953- , American politician and businessman, b. Midland, Tx, Univ. of Texas, Austin (B.A., 1974). Bush is ...

fireproofing

(Encyclopedia)fireproofing, method of making normally combustible materials as nearly noncombustible as possible. Fireproofing generally applies to textiles and construction materials that are treated with a soluti...