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argon

(Encyclopedia)argon ärˈgŏn [key] [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. −189.2℃; b.p. −185.7℃; density 1.784 grams per liter at STP; valence 0. Argon is a col...

frost

(Encyclopedia)frost or hoarfrost, ice formed by the condensation of atmospheric water vapor on a surface when the temperature of the surface is below 32℉ (0℃). In the formation of frost, a gas (water vapor) is ...

Ingres, Jean Auguste Dominique

(Encyclopedia)Ingres, Jean Auguste Dominique zhäN ōgüstˈ dômēnēkˈ ăNˈgrə [key], 1780–1867, French painter, b. Montauban; son of a sculptor. He studied with J. L. David in Paris and in 1801 won the Prix...

rubidium

(Encyclopedia)rubidium ro͞obĭdˈēəm [key], metallic chemical element; symbol Rb; at. no. 37; at. wt. 85.4678; m.p. 38.89℃; b.p. 686℃; sp. gr. 1.53 at 20℃; valence +1. Rubidium is a very soft silver-white ...

saga, in Old Norse Literature

(Encyclopedia)saga, in Old Norse literature, especially Icelandic and Norwegian, narrative in prose or verse, centering on a legendary or historical figure or family. Sagas may be divided into sagas of the kings, m...

Bosch, Hieronymus

(Encyclopedia)Bosch, Hieronymus, or Jerom Bos hērônˈĭməs, yāˈrôm bôs [key], c.1450–1516, Flemish painter. His surname was originally van Aeken; Bosch refers to 's-Hertogenbosch (popularly called Den Bosc...

storm

(Encyclopedia)storm, disturbance of the ordinary conditions of the atmosphere attended by wind, rain, snow, sleet, hail, or thunder and lightning. Types of storms include the extratropical cyclone, the common, larg...

metal

(Encyclopedia)metal, chemical element displaying certain properties by which it is normally distinguished from a nonmetal, notably its metallic luster, the capacity to lose electrons and form a positive ion, and th...

hydrogen

(Encyclopedia)hydrogen hīˈdrəjən [key] [Gr.,=water forming], gaseous chemical element; symbol H; at. no. 1; interval in which at. wt. ranges 1.00784–1.00811; m.p. −259.14℃; b.p. −252.87℃; density 0.08...

isomer

(Encyclopedia)isomer īˈsəmər [key], in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the molecule). Isomerism is the occurrence of ...