A vacuum bioreactor is a device that supports a biologically active environment in vacuum conditions. It is a vessel where a chemical process involving organisms or biochemically active substances derived from such organisms is carried out, either aerobically or anaerobically. It supplies a homogenous environment by constant stirring and gives the cells a controlled environment by ensuring the same temperature, pH, and oxygen levels. It is commonly cylindrical in shape with different sizes,  and its body is mainly made of stainless steel.