Instantaneous Method

The instantaneous melting point is calculated using the expression: (t1+t2)/2, in which t1 is the first temperature and t2 the second temperature. Record the temperature t1 at which the substance melts instantaneously for the first time in contact with the metal. Stop the heating. During cooling drop a few particles of the substance at regular intervals on the block, cleaning the surface after each test. Record the temperature t2 at which the substance ceases to melt instantaneously when it comes in contact with the metal Calibration of the apparatus. This method can be used with solids that are easy to grind.