Methodical manual for performing laboratory work in the field of physics - molecular physics . The purpose of the work is to study the methods of studying the processes of solidification (melting) of oil and oil products . The work consists in measuring the temperature dependence of the quenching (melting) sample on time. The measurement results determine the value of the temperature of solidification (melting). A brief theory and methods for determining the temperature of solidification (melting). Recommendations for the implementation, design, computer operation and processing of measurement results. Finally, the control questions are formulated