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mercaptan
(Encyclopedia)mercaptan thīˈōl [key], any of a class of organic compounds containing the group –SH bonded to a carbon atom. The volatile low-molecular-weight mercaptans have disagreeable odors. Mercaptans are ...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 ...capybara
(Encyclopedia)capybara kăpĭbârˈə [key], mammal of Central and much of South America. It is the largest living member of the order Rodentia (the rodents) reaching a length of 4 ft (120 cm) and a weight of 75 to...Carothers, Wallace Hume
(Encyclopedia)Carothers, Wallace Hume kərŭᵺˈərz [key], 1896–1937, American chemist, b. Burlington, Iowa. He received his doctorate at the Univ. of Illinois in 1924, then taught organic chemistry there and a...Addison's disease
(Encyclopedia)Addison's disease [for Thomas Addison], progressive disease brought about by atrophy of the outer layer, or cortex, of the adrenal gland; it is also called chronic adrenocortical insufficiency. The de...nuclear weapons
(Encyclopedia)nuclear weapons, weapons of mass destruction powered by atomic, rather than chemical, processes. Nuclear weapons produce large explosions and hazardous radioactive byproducts by means of either nuclea...chain reaction
(Encyclopedia) CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause further fissions....Roskilde
(Encyclopedia)Roskilde rôsˈkĭlə [key], city (1992 pop. 40,928), capital of Roskilde co., E Denmark, a port on the Roskilde Fjord (an arm of the Isefjord). Manufactures of this industrial city include processed ...Ridgway, Matthew Bunker
(Encyclopedia)Ridgway, Matthew Bunker, 1895–1993, U.S. general, b. Fort Monroe, Va. A West Point graduate, in World War II he was made (1942) assistant division commander and then commander of the 82d Infantry Di...spectroscope
(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...Browse by Subject
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