A Magnetic Stirrer Bar is a Magnetic bar used to stir a liquid mixture or solution, usually in a laboratory

• The stir bar’s motion is driven by a separate rotating magnet or assembly of electromagnets (i.e., coils) located beneath the vessel containing the liquid.
• Since glass does not affect a magnetic field appreciably (it is transparent to magnetism), and most chemical reactions take place in glass vessels, magnetic stir bars work well in glass vessels.

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