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voltaic cell

(Encyclopedia)voltaic cell, a simple device with which chemical energy is converted into electrical energy. Two dissimilar metals (e.g., copper and zinc) are immersed in an electrolyte (e.g., a dissolved sulfate). ...

Szent-Gyorgyi, Albert von

(Encyclopedia)Szent-Gyorgyi, Albert von älˈbĕrt fən sĕntˌ-dyörˈdyĭ [key], 1893–1986, American biochemist, b. Hungary, M.D. Univ. of Budapest, 1917; Ph.D. Cambridge, 1927. After teaching at the universiti...

Brown, Walter Folger

(Encyclopedia)Brown, Walter Folger fōlˈjər [key], 1869–1961, American cabinet officer, b. Massillon, Ohio. A lawyer of Toledo, Ohio, he became prominent in Republican politics and was (1927–29) Assistant Sec...

formic acid

(Encyclopedia)formic acid or methanoic acid mĕthˌənōˈĭk [key], HCO2H, a colorless, corrosive liquid with a sharp odor; it boils at 100.7℃ and solidifies at 8.4℃. It has the lowest molecular weight and is ...

Destutt de Tracy, Antoine Louis Claude, Comte

(Encyclopedia)Destutt de Tracy, Antoine Louis Claude, Comte äNtwänˈ lwē klōd kôNt dĕstütˈ də träsēˈ [key], 1754–1836, French philosopher and psychologist. Although active in the Napoleonic government...

Vranitzky, Franz

(Encyclopedia)Vranitzky, Franz fräns vränētˈskē [key], 1937–, Austrian political leader, chancellor of Austria (1986–97), b. Vienna. After receiving a doctorate in economics he became a banker (1961–70)....

phosgene

(Encyclopedia)phosgene fŏsˈjēn [key], colorless poison gas, first used during World War I by the Germans (1915). When dispersed in air, the gas has the odor of new-mowed hay. The gas is highly toxic; when inhale...

weathering

(Encyclopedia)weathering, collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these ...

commutation of sentence

(Encyclopedia)commutation of sentence, in criminal law, reduction of a sentence for a criminal act by action of the executive head of the government. Like pardon, commutation of sentence is a matter of grace, not o...

D'Alembert's principle

(Encyclopedia)D'Alembert's principle dălˈəmbârzˌ [key], in mechanics, principle permitting the reduction of a problem in dynamics to one in statics. This is accomplished by introducing a fictitious force equal...