Precipitation is also useful to isolate the products of a reaction during workup. Ideally, the product of the reaction is insoluble in the reaction solvent. Thus, it precipitates as it is formed, preferably forming pure crystals. An example of this would be the synthesis of porphyrins in refluxing propionic acid.
Freebase(0.00 / 0 votes)Rate this definition: Cellophane. Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air, oils, greases, bacteria and water makes it useful for food packaging.
Medical Definition of monophasic. 1  1: having a single phase; specifically : relating to or being a record of a nerve impulse that is negative or positive but not both a monophasic action potentialâcompare diphasic b, polyphasic 1. 2: having a single period of activity followed by a period of rest in each 24-hour period humans are naturally monophasic beings.