An apparatus for condensing vegetable juices, or for drying fruit by heat.
2.
Any device designed to evaporate a fluid.
3.
Specifically: The portion of a refrigeration system in which the refrigerant evaporates and thus absorbs heat.
rotary evaporator (Chem.) a device used in laboratories in which a liquid is evaporated by reducing the pressure and applying heat, while rotating the liquid in a vessel such as a round-bottomed flask. The reduced pressure speeds the evaporation process and allows the evaporation to be conducted at temperatures lower than would otgherwise be possible, thus reducing decomposition of unstable substances. The rotation also serves to increase the surface area from which evaporation takes place and to reduce the effect of "bumping", the sudden burst of vaporization that can scatter liquid exposed to reduced pressure.
... examiner chose another chair close by, cleared his throat, shot his cuffs, and pulled up the knees of his trousers. The Head Examiner, without looking up or desisting from his rapid writing, began to express his deep regret that the author apparently preferred to work an evaporator under a pressure instead of a vacuum. There might possibly be some reason for this which he, the Examiner, had overlooked, and he would appreciate it if the author could so far unbend as to outline his experience in this business. Whereupon the Head Examiner proceeded with his ... — An Ocean Tramp • William McFee
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