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mineral

(Encyclopedia)mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form. A few of the mi...

vanadium

(Encyclopedia)vanadium vənāˈdēəm [key], metallic chemical element; symbol V; at. no. 23; at. wt. 50.9415; m.p. about 1,890℃; b.p. 3,380℃; sp. gr. about 6 at 20℃; valence +2, +3, +4, or +5. Vanadium is a ...

mirror

(Encyclopedia)mirror, in optics, a reflecting surface that forms an image of an object when light rays coming from that object fall upon it (see reflection). Usually mirrors are made of plate glass, one side of whi...

chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

Hofu

(Encyclopedia)Hofu hōˈfo͞o [key], city, Yamaguchi prefecture, SW Honshu, Japan, on the Suo Sea. It is a ...

germicide

(Encyclopedia)germicide jûrˈmĭsīd [key], chemical substance capable of killing many different types of microorganisms; also called disinfectant. ...

Orekhovo-Zuyevo

(Encyclopedia)Orekhovo-Zuyevo əryĕˈkhəvə-zo͞oˈyĭvə [key], city (1989 pop. 137,000), W central European Russia, on the Klyazma River. There is a large textile industry (dating from the 18th cent.) and a maj...

West Bromwich

(Encyclopedia)West Bromwich brŭmˈĭj, –ĭch, brŏmˈwĭch [key], town, Sandwell borough, W central England. On the site of a 12th-century Benedictine priory, West Bromwich has foundries and engineering and chem...

Ulhasnagar

(Encyclopedia)Ulhasnagar o͞olˈhəsnəgər [key], city (1991 pop. 368,772), Maharashtra state, W central India. It is a residential and industrial suburb of Mumbai, with chemical and textile chemicals. It lies in ...

Saint Helens

(Encyclopedia)Saint Helens, metropolitan borough (1991 pop. 114,397), NW England, in the Greater Liverpool metropolitan area. It is a major center of glass manufacture in England. The city also has iron and brass f...