Pressure has a specific influence on the light scattering and electric permittivity in those liquids in which all molecules have an unsaturated double bond C&dbnd;C. Strong changes of intensity of transmitted and scattered light in those liquids were observed during its transition to the high-pressure phase. Changes of permittivity with temperature in typical solidification of castor oil are bigger than those in the new pressure induced phase transition described earlier [1 - 3] . The temperature, for which $\partial \varepsilon^{\prime}/\partial t = 0$ , can be defined as transition temperature of order-disorder. It means that at this temperature the existing electric field does not produce any order. The changes of permittivity vs. temperature at given constant pressures (0, 0.3, 0.6 and 1.0 GPa) allow one to obtain the order-disorder transition temperature, which is shifted to higher temperatures when pressure increases, (-30, 0, 10, 40 °C) respectively. The solidification processes of castor oil are discussed from the thermodynamic point of view using permittivity vs. temperature curves at constant pressures. [ABSTRACT FROM AUTHOR]
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