coefficient

(ko-ef-ish’ent). In chemistry, a number or figure put before a chemic formula to indicate how many times the formula is to be multiplied. c. of absorption, a number indicating the volume of a gas absorbed by a unit volume of a liquid at o° C. and a pre ure of 760 mm. Ambard’s c. See Ambard's formula under formula. Baumann’s c., the ratio of the ethereal to the total sulphates in the urine. biologic c., the amount of potential energy consumed by the body when at rest. Bouchard’s c., the ratio between the amount of urine and the total solids of the urine. c. of conductivity, a number indicating the uantity of heat that pa es in a unit of time through a unit thickne of a substance when the difference in temperature is 1° C. distribution c. Same as partition c. ¢. of expansion, a number indicating the amount 4 substance expands when heated 1° C. FPalta’s c., the percentage of ingested sugar eliminated from the system. hygienic laboratory c., a number representing the disinfecting value of a substance obtained by dividing the weakest solution of the disinfectant that will kill typhoid bacilli by the weakest solution of carbolic acid that will kill the bacilli in the same length of time. isotonic c.,a number showing the quantity of salt which should be added to distilled water to prevent its destroying the erythrocytes when added to blood. Lancet c., a number representing the disinfecting value of a substance as compared with carbolic acid. lethal c., that concentration of a disinfectant that will kill spore le bacteria (inferior lethal c.) or bacteria spores (superior lethal c.) in water at a temperature of 20°-25° C. in the shortest time. Long’s c., a figure, 2.6, used to obtain the number of grams of solids in 1000 c.c. of urine by multiplying the last two figures of the specific gravity. 6. of part age, a number indicating the ratio between the amount of an acid absorbed by ether from an aqueous solution of the acid and the amount remaining in solution. partition c., the proportion of a given substance that is distributed betwcen two or more different solvents used at the same time. Called also distribution c. phenol c. Sce Ridcul-Walker c. Rideal-Walker c., a number indicating the disinfecting value of a substance: it is the quotient obtained by dividing the number representing the dilution of a disinfectant which kills an organism in a fixed time by the number representing the degree of dilution of carbolic acid which kills the organism in the same time. Called also phenol c. temperature c., the relation between the temperature of substances and the chemic reaction between them. Cf. tan’t Hoffs law under law. Trapp’s c. See Trapp’s formula under formula. urotoxic c., a number expre ing the toxicity of the urine: it is the quantity of toxic matter produced in twenty-four hours by one kilogram of the poison. Yvon’'sc., the ratio between the quantity of urea and the phosphates of the urine. colarium, celarium (se-la’re-um) [L., from Gr. κοῖλος a hollow]. The membrane that lines the body-cavity, or calom: it consists of a parietal layer, the exocalarium, and a visceral layer, or endocalarium. It is also called mesothelium or calom-epithelium.