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calcium chloride
(Encyclopedia) calcium chloride, CaCl2, chemical compound that is crystalline, lumpy, or flaky, is usually white, and is very soluble in water. The anhydrous compound is hygroscopic; it rapidly…vacuum cleaner
(Encyclopedia) vacuum cleaner, mechanical device using a draft of air to remove dust, loose dirt, or other particulate matter from dry surfaces. It is especially useful on highly textured surfaces,…aureole, in physics
(Encyclopedia) aureoleaureoleôrˈēōlˌ [key], in physics, luminous circle seen when the sun or other bright light is observed through a diffuse medium, i.e., smoke, thin cloud, fog, haze, or mist. It…fresco
(Encyclopedia) frescofrescofrĕsˈkō [key] [Ital.,=fresh], in its pure form the art of painting upon damp, fresh, lime plaster. In Renaissance Italy it was called buon fresco to distinguish it from…haze
(Encyclopedia) haze, suspension in the atmosphere of minute dust or salt particles that are not individually seen but that nevertheless reduce visibility. So-called damp haze and dry haze produce…Laguna District
(Encyclopedia) Laguna District [Span.,=lake], irrigated area in E Durango and W Coahuila states, N central Mexico. Originally a 900,000-acre (364,200-hectare) tract, consisting of large estates, the…Bosch, Carl
(Encyclopedia) Bosch, Carl, 1874–1940, German chemist and engineer, Ph.D. Univ. of Leipzig, 1898. In 1899, Bosch began working as a chemist for BASF, which merged with six other German chemical firms…psittacosis
(Encyclopedia) psittacosispsittacosissĭtəkōˈsĭs [key] or parrot fever, infectious disease caused by the species of Chlamydia psittaci and transmitted to people by birds, particularly parrots,…nuclear winter
(Encyclopedia) nuclear winter, theory holding that the smoke and dust produced by a large nuclear war would result in a prolonged period of cold on the earth. The earliest version of the theory,…Saint Elmo's fire
(Encyclopedia) Saint Elmo's fire, luminous discharge of electricity extending into the atmosphere from some projecting or elevated object. It is usually observed (often during a snowstorm or a dust…Trending
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