A magnetic stirrer or magnetic mixer could be a laboratory device that employs a rotating magnetic flux to cause a stir bar (also referred to as "flea") immersed in an exceedingly} liquid to spin very quickly, so stirring it. The rotating field is also created either by a rotating magnet or a group of stationary electromagnets, placed to a lower place the vessel with the liquid. Magnetic stirrers area unit typically employed in chemistry and biology, wherever they'll be used within hermetically closed vessels or systems, while not the requirement for sophisticated rotary seals. they're most well-liked over gear-driven motorized stirrers as a result of they're quieter, a lot of economical, and don't have any moving external elements to interrupt or wear out (other than the straightforward magnet itself). Magnetic stir bars work well in glass vessels normally used for chemical reactions, as glass doesn't appreciably have an effect on a magnetic flux.
The restricted size of the bar means magnetic stirrers will solely be used for comparatively tiny experiments, of four liters or less. Stir bars even have issue in handling viscous liquids or thick suspensions. For larger volumes or a lot ofviscous liquids, some form of mechanical stirring is often required. Because of its tiny size, a stirring bar is a lot of simply clean and sterilized than alternative stirring devices. they are doing not need lubricants that might contaminate the reaction vessel and therefore the product. Magnetic stirrers may additionally embody a hot plate or another means that for heating the liquid.
