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Mace, chemical spray

(Encyclopedia)Mace, chemical spray device used by police in riot control. Mace is ordinary tear gas (chloroacetophenone, or CN) in a volatile solvent contained in a spray can. It causes severe lacrimation and tempo...

Ring nebula

(Encyclopedia)Ring nebula, planetary nebula in the northern constellation Lyra; cataloged as M57 or NGC 6720. It is perhaps the most famous and beautiful nebula of this type. Its name describes the appearance of th...

Durgapur

(Encyclopedia)Durgapur do͝orˈgäpo͝or [key], city, West Bengal state, E central India, on the Damodar River. One ...

Bastrop

(Encyclopedia)Bastrop băsˈtrŏpˌ [key], city (2020 pop. 9,711), seat of Morehouse parish, NE La.; founded ...

Brownwood

(Encyclopedia)Brownwood, city (2020 pop. 18,862), seat of Brown co., central Tex.; inc. 1876. Its many industries include oil and gas, printing, and the manufacture o...

Welsbach mantle

(Encyclopedia)Welsbach mantle or Welsbach burner [for C. A. von Welsbach], cylindrical framework of gauze impregnated with oxides of thorium and cerium. When heated in a gas flame, it produces a very bright light b...

Independence

(Encyclopedia)Independence. 1 City (2020 pop. 6,064), seat of Buchanan co., NE Iowa; founded 1847. Located on the Wapsipinicon River, the town's grist mill ...

bubble chamber

(Encyclopedia)bubble chamber, device for detecting charged particles and other radiation by means of tracks of bubbles left in a chamber filled with liquid hydrogen or other liquefied gas. It was invented in 1952 b...

Mineral Wells

(Encyclopedia)Mineral Wells, city (1990 pop. 14,870), Palo Pinto and Parker counties, N Tex.; inc. 1882. Aluminum products, bottled mineral water, clothing, and pharmaceuticals are produced, and there is gas proces...

Dalton's law

(Encyclopedia)Dalton's law [for John Dalton], physical law that states that the total pressure exerted by a homogeneous mixture of gases is equal to the sum of the partial pressures of the individual gases. The par...