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.
Definition: Sarcophagus refers to the carved, generally stone case in which the linen-wrapped mummy was placed. The gilded sarcophagus of King Tut with painted face depicting the boy king is probably the best known of the Egyptian sarcophagi. Sarcophagus can be used to refer to a coffin -- especially one of stone. The plural of sarcophagus is usually sarcophagi, although it is sometimes written as sarcophaguses. Sarcophagus comes from the Greek for flesh-eater.