Rotary evaporator is a device used in chemical and biochemical laboratories for the efficient and gentle evaporation of solvents. The main components of a rotary evaporator are a vacuum system, consisting of a vacuum pump and a controller, a rotating evaporation flask, which can be heated, in a heated fluid bath, and a condenser with a condensate-collecting flask. The system works because lowering the pressure lowers the boiling point of liquids, including that of the solvent. This allows the solvent to be removed without excessive heating. Evaporation under vacuum can be performed in a standard distillation rig. However, the rotary evaporator has a key advantage. As the evaporating flask rotates, the liquids are forced to the outside of the flask with the centrifugal motion. This creates a larger surface area of the liquids and hence allows for quicker evaporation. Rotary evaporators are highly effective at removing the majority of organic solvents during the extraction process. The remainder of the solvents is usually removed using a high-vacuum line. Rotary evaporators are usually not recommended for removing aqueous solvent due to water's high boiling point.