We examine here the validity of the Pippard relations close to the melting point in the premelting region of hexadecane. For this verification, we analyze the observed data for the thermal expansivityαpobtained for various pressures at constant temperatures of 302 and 325 K in this system. By calculating the isothermal compressibilityκTand the specific heatCpin the same pressure region of the premelting region of hexadecane, we obtain thatCpvaries linearly withαpand also thatαpvaries linearly withκTfor this system. This indicat es that some molecular organic compounds, such as solid hexadecane studied here, can exhibitλ-phase transitions prior to melting which are expected to verify the Pippard relations.
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