Steam jet ejectors provide vacuum using high-pressure steam as the motive fluid, requiring no external power source. They have no moving parts, making them reliable and easy to maintain. Ejectors work by accelerating steam through a converging-diverging nozzle, which entrains the suction fluid and recompresses it at an intermediate pressure through a diffuser. Ejectors can be single or multi-stage, with condensers used to improve efficiency, and are well-suited for applications that require vacuum where steam is readily available such as drying and distillation.