A magnetic stirrer is a laboratory device that employs a rotating magnetic field generated by a rotating magnet or stationary electromagnet to cause a stirrer bar immersed within a liquid to spin and thus quickly stir or mix the solution.
A stir bar and a hot plate stirrer are the two main parts of a magnetic stirrer. A stationary electromagnet, a hot plate, a temperature control knob, and a speed control knob are some of the additional components found inside a hot plate stirrer machine.