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watch
(Encyclopedia)watch, small, portable timepiece usually designed to be worn on the person. Other kinds of timepieces are generally referred to as clocks. At one time it was generally believed that the first watches ...personal digital assistant
(Encyclopedia)personal digital assistant (PDA), lightweight, hand-held computer designed for use as a personal organizer with communications capabilities; also called a handheld. A typical PDA has no keyboard, rely...cathode-ray tube
(Encyclopedia) CE5 Cathode-ray tube cathode-ray tube (CRT), special-purpose electron tube in which electrons are accelerated by high-voltage anodes, formed into a beam by focusing electrodes, and projected towar...liquid air
(Encyclopedia)liquid air, ordinary air that has been liquefied by compression and cooling to extremely low temperatures (see liquefaction). Its commercial preparation involves purification by washing to remove solu...solution
(Encyclopedia) CE5 Solubility curves solution, in chemistry, homogeneous mixture of two or more substances. The dissolving medium is called the solvent, and the dissolved material is called the solute. A solutio...Nicol prism
(Encyclopedia)Nicol prism nĭkˈəl [key], optical device invented (1828) by William Nicol of Edinburgh. It consists essentially of a crystal of calcite, or Iceland spar, that is cut at an angle into two equal piec...X-ray crystallography
(Encyclopedia)X-ray crystallography, the study of crystal structures through X-ray diffraction techniques. When an X-ray beam bombards a crystalline lattice in a given orientation, the beam is scattered in a defini...Crystal Lake
(Encyclopedia)Crystal Lake, city (2020 pop. 40,269), McHenry co., NE Ill., in a farming area; inc. 1874. Electrical components, tools, plastics, and machinery are man...Crystal Palace
(Encyclopedia)Crystal Palace, building designed by Sir Joseph Paxton and erected in Hyde Park, London, for the Great Exhibition in 1851. In 1854 it was removed to Sydenham, where, until its damage by fire in 1936, ...rock crystal
(Encyclopedia)rock crystal: see quartz.Browse by Subject
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