Evaporation is used to separate solid or liquid solutes from prepared samples for analysis by converting the sample's solvent into a vapor. Laboratory evaporators use a variety of techniques to speed up the evaporation process, such as heat, motion, gas, reduced pressure or a combination of two or more of these methods. Evaporators are a staple in many labs, particularly in the pharmaceutical, environmental, food/beverage, academic, and medical fields. Each evaporation method is suitable for certain applications. There are several types of evaporators: nitrogen blowdown evaporator, rotary evaporator, centrifugal evaporator and Kuderna-Danish solvent evaporator.