Pressure-induced phase transition in soy oil

Following the earlier works [R.M. Siegoczyński, Reports of the Institute of Physics. No. 46, Publishing House of the Warsaw University of Technology (1998). R.M. Siegoczyński, J. Je¸drzejewski and R. Wiśniewski, High Pressure Res. 1 225-301 (1989).] on the investigation of oily liquids such as oleic and triolein, authors predicted the occurrence of a phase transition in the wide class of commercial oils containing oils with double carbon bonds. Those predictions have been confirmed by the observation of the phase transition in rapeseed oil [A.J. Rostocki, R. Wiśniewski and T. Wilczyńska, in press]. The present article shows further confirmation of those predictions presenting first-order phase transition in soy oil. The measurements performed in the range up to 1 GPa have shown pressure-related discontinuity of permittivity and volume.