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barium

(Encyclopedia)barium bârˈēəm [key] [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.327; m.p. 725℃; b.p. 1,640℃; sp. gr. 3.5 at 20℃; valence +2. Barium is a soft, silver-white, ...

chromium

(Encyclopedia)chromium krōˈmēəm [key] [Gr.,=color], metallic chemical element; symbol Cr; at. no. 24; at. wt. 51.9961; m.p. about 1,857℃; b.p. 2,672℃; sp. gr. about 7.2 at 20℃; valence +2, +3, +6. Chromiu...

Sullivan, Louis Henry

(Encyclopedia)Sullivan, Louis Henry, 1856–1924, American architect, b. Boston, studied at the Massachusetts Institute of Technology and the École des Beaux-Arts, Paris. He is of great importance in the evolution...

metallurgy

(Encyclopedia)metallurgy mĕtˈəlûrˌjē [key], science and technology of metals and their alloys. Modern metallurgical research is concerned with the preparation of radioactive metals, with obtaining metals econ...

Lapland

(Encyclopedia)Lapland lăpˈlăndˌ [key], Finn. Lappi, Nor. Lapland, Swed. Lappland, vast region of N Europe, largely within the Arctic Circle. It includes the Norwegian provinces of Finnmark and Troms and part of...

Edison, Thomas Alva

(Encyclopedia)Edison, Thomas Alva, 1847–1931, American inventor, b. Milan, Ohio. A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his...

Sulawesi

(Encyclopedia)Sulawesi sĕlˈəbēz [key], island (1990 pop. 12,511,163), c.73,000 sq mi (189,070 sq km), largest island in E Indonesia, E of Borneo, from which it is separated by the Makasar Strait. Extremely irre...

Sichuan

(Encyclopedia)Sichuan or Szechwan sŭˈchwänˈ [key] [four rivers], province (2010 pop. 80,418,200), c.220,000 sq mi (569,800 sq km), SW China. The capital is Chengdu. A naturally isolated region surrounded by mou...

Luzon

(Encyclopedia)Luzon lo͞ozŏnˈ [key], island (1990 pop. 30,797,458), 40,420 sq mi (104,688 sq km), largest, most populous, and most important of the Philippine Islands. As the major island, Luzon has played the ...

Precambrian

(Encyclopedia)Precambrian, name of a major division of geologic time (see Geologic Timescale, tablegeologic timescale, table), from c.5 billion to 570 million years ago. It is now usually divided into the Archean a...