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Levelland

(Encyclopedia)Levelland lĕvˈəlăndˌ [key], city (1990 pop. 13,986), seat of Hockley co., NW Tex., on the Llano Estacado; inc. 1926. The economy is based chiefly on oil and gas, agriculture, and the manufacture ...

Liberal

(Encyclopedia)Liberal, city (1990 pop. 16,573), seat of Seward co., SW Kans.; founded 1888, inc. 1945. It is the trade center for a grazing and farm area. Oil and natural gas are extracted, and helium is processed ...

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...

Bastrop

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

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...

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...

Alice

(Encyclopedia)Alice, city (2020 pop. 17,891), seat of Jim Wells co., S Tex.; inc. 1910. Long a cow town at a railroad junction, Alice remains a cattle-shipping center. Oil and natural gas are also impor...

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...