We have developed an alternating current (AC) calorimetry method using a piston-cylinder apparatus for measuring heat capacity and thermal conductivity under high pressures up to 2.1 GPa and at low temperatures down to ∼40 K. This new AC calorimetry is based on a planar one-dimensional heat conduction model employing a pair of platinum resistors, enabling the measurement of thermal properties in liquid samples-an application that was not straightforward with conventional AC calorimetry. We demonstrate the effectiveness of this method through its application to NH4Cl, cyclohexene, methylcyclohexane, and ice.
Ito et al. (Sun,) studied this question.