<P> The Thiele tube, named after the German chemist Johannes Thiele, is a laboratory glassware designed to contain and heat an oil bath . Such a setup is commonly used in the determination of the melting point of a substance . The apparatus itself resembles a glass test tube with an attached handle . </P> <P> Oil is poured into the tube, and then the "handle" is heated, either by a small flame or some other heating element . The shape of the Thiele tube allows for formation of convection currents in the oil when it is heated . These currents maintain a fairly uniform temperature distribution throughout the oil in the tube . The side arm of the tube is designed to generate these convection currents and thus transfer the heat from the flame evenly and rapidly throughout the heating oil . The sample, packed in a capillary tube, is attached to the thermometer, and held by means of a rubber band or a small slice of rubber tubing . The Thiele tube is usually heated using a microburner with a small flame . </P>

What will be the effect if thiels tube is heated vigorously