The heat capacities of 1-methyl-3,5-diphenyl- pyrazole have been precisely determined with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 370 K. A phase transition form solid to liquid is observed at the peak temperature of (332.903±0.152)K. The molar enthalpy and entropy of the phase transition as well as chemical purity of the substance are determined to be (17463.48±21.81)J·mol^-1,(52.55±0.06)J·K· mol^ 1 and 99.54%, respectively, on the basis of the heatcapacity measurements. The further research of solid-liquid phase transition for this compound has been carried out by means of DSC technique.

Key words: PYRAZOLE P, SPECIFIC HEAT, THERMODYNAMIC PROPERTIES, DIFFERENTIAL SCANNING CALORIMETRY