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Bentonville

(Encyclopedia)Bentonville, city (2020 pop. 54,164), seat of Benton co., extreme NW Ark., in the Ozark Mts.; settled 1837 and named for Senator Thomas Hart Benton. Loc...

Wind Cave National Park

(Encyclopedia)Wind Cave National Park, 28,295 acres (11,459 hectares), in the Black Hills, SW S.Dak.; est. 1903. Wind Cave, discovered in 1881, was named for the strong air currents that blow alternately in and out...

Rochelle salt

(Encyclopedia)Rochelle salt, colorless to blue-white orthorhombic crystalline salt with a saline, cooling taste. It is also called Seignette salt after Pierre Seignette, an apothecary of La Rochelle, France, who wa...

prism

(Encyclopedia)prism, in optics, a piece of translucent glass or crystal used to form a spectrum of light separated according to colors. Its cross section is usually triangular. The light becomes separated because d...

diphosgene

(Encyclopedia)diphosgene dīˌfŏzˈjēn [key], colorless liquid developed as a military poison. It boils at 128℃; its vapors have the odor of phosgene. Diphosgene is a lung irritant but is only slightly lachrima...

cyclohexane

(Encyclopedia)cyclohexane sīˌkləhĕkˈsān [key], C6H12, colorless liquid hydrocarbon. It is a cyclic alkane that melts at 6℃ and boils at 81℃. It is nearly insoluble in water. Cyclohexane is found naturally...

chloroprene

(Encyclopedia)chloroprene klōrˈəprēnˌ [key] or 2-chloro-1,3-butadiene, colorless liquid organic compound used in the synthesis of neoprene and certain other rubbers. The structure of the chloroprene molecule i...

encaustic

(Encyclopedia)encaustic, painting medium in which the binder for the pigment is wax or wax and resin. Examples of encaustic tomb portraits from Roman Egypt bear witness to the durability of the medium, which is tho...

hydraulic machine

(Encyclopedia)CE5 Hydraulic pressure: In any hydraulic device the pressure exerted by one piston is transmitted throughout the fluid. Since pressure equals force divided by area, a small force (F1) exerted on a ...

sewerage

(Encyclopedia)sewerage, system for the removal and disposal of chiefly liquid wastes and of rainwater, which are collectively called sewage. The average person in the industrialized world produces between 60 and 14...