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Unknown Soldier, Tomb of the

(Encyclopedia)Unknown Soldier, Tomb of the, form of memorial to a nation's war dead, adopted by many countries after World War I. The Tomb of the Unknowns, a memorial to the American dead of World Wars I and II, th...

Bertha of the Big Foot

(Encyclopedia)Bertha of the Big Foot: see Bertrada. ...

alkaline-earth metals

(Encyclopedia)alkaline-earth metals, metals constituting Group 2 of the periodic table. Generally, they are softer than most other metals, react readily with water (especially when heated), and are powerful reducin...

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...

Charles III, emperor of the West, king of the East Franks, and king of the West Franks

(Encyclopedia)Charles III or Charles the Fat, 839–88, emperor of the West (881–87), king of the East Franks (882–87), and king of the West Franks (884–87); son of Louis the German, at whose death he inherit...

Carloman, d. 754, mayor of the palace in the kingdom of Austrasia, brother of Pepin the Short

(Encyclopedia)Carloman, d. 754, mayor of the palace in the kingdom of Austrasia after the death (741) of his father, Charles Martel. Ruling with his brother, Pepin the Short, he carried on successful wars against t...

boron

(Encyclopedia)boron bōrˈŏn [key] [New Gr. from borax], chemical element; symbol B; at. no. 5; interval in which at. wt. ranges 10.806–10.821; m.p. about 2,300℃; sublimation point about 2,550℃; sp. gr. 2.3 ...

Babbitt metal

(Encyclopedia)Babbitt metal, an antifriction metal first produced by Isaac Babbitt in 1839. In present-day usage the term is applied to a whole class of silver-white bearing metals, or “white metals.” These all...

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...

alkali metals

(Encyclopedia)alkali metals, metals found in Group 1 of the periodic table. Compared to other metals they are soft and have low melting points and densities. Alkali metals are powerful reducing agents and form univ...