In a short path evaporator, the condenser is located inside the evaporator body. Due to the different design details, short path evaporators can be used down to 0.001 mbar as compared with conventional thin film evaporators, which can be used down to approximately 1 mbar. Residence time in thin film and short path evaporators is only few seconds, which helps to avoid thermal decomposition of the product. There are several basic design variations of short-path evaporators. These are the short-path falling-film evaporator, the centrifugal molecular still, and the short path, wiped-film evaporator. Short path evaporator integrates the features and advantages of thin film or wiped film evaporators but adds internal condensing for applications where the operating pressures must be between 0.5 mmHg and 0.001 mmHg or less.