Thiele’s Melting Point Tube is a laboratory equipment used to determine the melting point of a substance. It is a cylindrical glass tube with a closed end and an open end, and it is used to contain a sample of the substance being tested. The melting point of a substance is the temperature at which it changes from a solid state to a liquid state.

Thiele’s Melting Point Tube is used to determine the melting point by heating the sample slowly and observing the temperature at which the substance begins to melt.

The tube is typically heated using a Bunsen burner or a melting point apparatus, and the temperature is monitored using a thermometer. Thiele’s Melting Point Tube is a commonly used tool in the fields of chemistry and material science for the identification of substances and for quality control purposes.