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	equivalent weight equivalent weight The equivalent weight of an element or radical is equal to its atomic weight or formula weight divided by the valence it assumes in compounds. The unit of equivalent weight is the atomic mass unit ; the amount of a substance in grams numerically equal to the equivalent... Read more
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	protein protein any of the group of highly complex organic compounds found in all living cells and comprising the most abundant class of all biological molecules. Protein comprises approximately 50% of cellular dry weight. Hundreds of protein molecules have been isolated in pure, homogeneous form; many... Read more
	formula weight formula weight in chemistry, a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a formula by the number of atoms of that element present in the formula, and then adding all of these products together. For example, the formula weight of water (H 2 O)... Read more
	atomic weight atomic weight mean (weighted average) of the masses of all the naturally occurring isotopes of a chemical element , as contrasted with atomic mass , which is the mass of any individual isotope. Although the first atomic weights were calculated at the beginning of the 19th cent., it was not... Read more
	molecular weight molecular weight weight of a molecule of a substance expressed in atomic mass units (amu). The molecular weight may be calculated from the molecular formula of the substance; it is the sum of the atomic weights of the atoms making up the molecule. For example, water has the molecular... Read more
	hydrocarbon hydrocarbon , any organic compound composed solely of the elements hydrogen and carbon. The hydrocarbons differ both in the total number of carbon and hydrogen atoms in their molecules and in the proportion of hydrogen to carbon. The hydrocarbons can be divided into various homologous series. Each... Read more
	beryllium beryllium [from beryl ], metallic chemical element; symbol Be; at. no. 4; at. wt. 9.01218; m.p. about 1,278°C; b.p. 2,970°C (estimated); sp. gr. 1.85 at 20°C; valence +2. Beryllium is a strong, extremely light, high-melting, silver-gray metal with a close-packed hexagonal crystalline... Read more
	English units of measurement English units of measurement principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U.S. Customary System of units, used in the United States and dependencies, and the British... Read more
	Diet industry Weight Watchers International Inc. 175 Crossways Park WestWoodbury, New York 11797U.S.A.Telephone: (516) 390-1400Toll Free: (800) 651-6000Fax: (516) 390-1334Web site: http://www.weightwatchers.com Public Company Incorporated: 1963Employees: 46,000Sales: $1.02 billion (2004)Stock Exchanges: New... Read more