A blender with a red lid sitting on a counter

An anaerobic jar is a laboratory device designed to create an oxygen-free environment for the cultivation of anaerobic microorganisms. It is typically made of a durable, transparent material with a gas-tight seal. Inside, chemical sachets or gas packs generate an anaerobic atmosphere by removing oxygen and producing carbon dioxide. An indicator strip often confirms the absence of oxygen. These jars are essential for growing anaerobes, important in microbiology and clinical diagnostics.