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diffusion
(Encyclopedia)diffusion, in chemistry, the spontaneous migration of substances from regions where their concentration is high to regions where their concentration is low. Diffusion is important in many life process...piano
(Encyclopedia)piano or pianoforte, musical instrument whose sound is produced by vibrating strings struck by felt hammers that are controlled from a keyboard. The piano's earliest predecessor was the dulcimer. The ...Boston, city, United States
(Encyclopedia)Boston, city (2020 pop. 692,600), state capital and seat of Suffolk co., E Mass., on Boston Bay, an arm of Massachusetts Bay; inc. 1822. The city includ...Lisbon
(Encyclopedia)Lisbon lĭzˈbən [key], Port. Lisboa, ancient Olisipo, city (1991 pop. 677,790), W Portugal, capital of Portugal and of Lisboa dist., on the Tagus River where it broadens to enter the Atlantic Ocean....Ai Weiwei
(Encyclopedia)Ai Weiwei īˈ wāwā [key], 1957–, Chinese artist, architect, filmmaker, and political activist. He is the son of poet Ai Ch'ing, who was internally exiled (1958–76) to work camps with his family...Hagia Sophia
(Encyclopedia)Hagia Sophia häˈjə sōfēˈə, hāˈjēə, [key] [Gr.,=Holy Wisdom] or Santa Sophia, Turkish Ayasofya, originally a Christian church at Constantinople (now İstanbul, Turkey) and then a mosque unde...Hong Kong
(Encyclopedia) CE5 Hong Kong hŏng kŏng [key], Mandarin Xianggang, special administrative region of China, formerly a British crown colony (2015 est. pop. 7,246,000), land area 422 sq mi (1,092 sq km), adjacent ...New Orleans
(Encyclopedia)New Orleans ôrˈlēənz –lənz, ôrlēnzˈ [key], city (2006 pop. 187,525), coextensive with Orleans parish, SE La., between the Mississippi River and Lake Pontchartrain, 107 mi (172 km) by water f...land use
(Encyclopedia)land use, exploitation of land for agricultural, industrial, residential, recreational, or other purposes. Because the United States historically has a laissez-faire attitude toward land use, the land...Houston
(Encyclopedia)Houston, city (2020 pop. 2,304,580), seat of Harris co., SE Tex., a deepwater port on the Houston Ship Channel; inc. 1837. Harrisburg (now part of Hou...Browse by Subject
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