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atomic weight

(Encyclopedia)atomic weight, mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element, as contrasted with atomic mass, which is the mass of any individual isotope. Althoug...

ear

(Encyclopedia)CE5 Ear ear, organ of hearing and equilibrium. The human ear consists of outer, middle, and inner parts. The outer ear is the visible portion; it includes the skin-covered flap of cartilage known ...

aerodynamics

(Encyclopedia)aerodynamics, study of gases in motion. As the principal application of aerodynamics is the design of aircraft, air is the gas with which the science is most concerned. Although aerodynamics is primar...

Turner, Joseph Mallord William

(Encyclopedia)Turner, Joseph Mallord William, 1775–1851, English landscape painter, b. London. Turner was the foremost English romantic painter and the most original of English landscape artists; in watercolor he...

Lawrence, Sir Thomas

(Encyclopedia)Lawrence, Sir Thomas, 1769–1830, English portrait painter, b. Bristol. He began to draw when very young and developed extraordinary talents as a draftsman; though he studied briefly at the Royal Aca...

K'ang Yu-wei

(Encyclopedia)K'ang Yu-wei käng yo͞o-wā [key], 1858–1927, Chinese philosopher and reform movement leader. He was a leading philosopher of the new text school of Confucianism, which regarded Confucius as a utop...

hydrothermal vent

(Encyclopedia)hydrothermal vent, crack along a rift or ridge in the deep ocean floor that spews out water heated to high temperatures by the magma under the earth's crust. Some vents are in areas of seafloor spread...

Cossa, Baldassare

(Encyclopedia)Cossa, Baldassare bäldäs-säˈrā kôsˈsä [key], c.1370–1419, Neapolitan churchman, antipope (1410–15; see Schism, Great) with the name John XXIII. He had a military career before entering the...

chemical reaction

(Encyclopedia)chemical reaction, process by which one or more substances may be transformed into one or more new substances. Energy is released or is absorbed, but no loss in total molecular weight occurs. When, fo...

snorkel

(Encyclopedia)snorkel, tube through which a submarine or diver can draw air while underwater. When in use, the top of the snorkel tube extends above the water surface into the air. The first snorkels were probably ...