Magnetic stir bars are highly chemically inert, small magnetic bars. Most heaters have a built-in magnet which can rotate: this causes the stir bar to rotate and the mixture to become homogenized.
As barras magnéticas de mestura son pequenas barras magnéticas quimicamente inertes. A maioría dos aquecedores teñen un imán incorporado que pode xirar: isto fai que a barra de mestura rode e a mestura se homoxeneize.