A rotary evaporator consists of a round flask in a bath of hot water, and is designed to evaporate solvents. The flask is rotated and the solvent collects under a vacuum onto a condenser and drips into a condensate collecting flask. In this way solutions can be concentrated or purified. By attaching a vacuum pump, the air pressure and therefore the boiling point of the fluid can be decreased.
Lurrungailu birakaria ur beroan jarritako matraze esferiko bat da eta disolbatzaileak lurruntzeko erabiltzen da. Matrazeak bira egiten du eta disolbatzailea kondentsadore batean jasotzen da hutsunearen eraginez. Honela disoluzioen konzentrazioa handiagotu edo txikiagotu daiteke. Irakite- puntua txikiagotzeko huts- ponpa bat gehitu daiteke.