what is stirrer

A stirrer is a device or implement used to mix or stir something. There are different types of stirrers, including mechanical and magnetic stirrers. A magnetic stirrer is a laboratory device that employs a rotating magnetic field to cause a stir bar immersed in a liquid to spin very quickly, thus stirring it. It consists of a magnetic bar placed within the liquid which provides the stirring action. The stir bars motion is driven by another rotating magnet or assembly of electromagnets in the stirrer device, beneath the vessel containing the liquid. Stirrers can be used in chemistry and biology, where they can be used to stir hermetically closed vessels or systems without the need for complicated rot seals. In addition, stirrers are preferred over gear-driven motorized stirrers because they are quieter, more efficient, and have no moving external parts to break or wear out (other than the simple bar magnet itself) . A stirring rod is a simple laboratory tool used to manually stir liquids. A stir stick is a type of stirrer used for stirring drinks or other liquids. Finally, a stirrer can also refer to a person who intentionally causes trouble between other people.