Abstract
An automated Tian-Calvet heat-flow calorimeter operating under digital control is described. It was calibrated in the range 85 to 290 K using synthetic sapphire. Procedures for measuring heat capacity and enthalpy of fusion are described. The accuracy of the heat-capacity measurements is 1.5 per cent between 85 and 100 K and 1 per cent above 100 K. Enthalpies of fusion are accurate to 1 per cent. Enthalpies of fusion and heat capacities between 85 and 270 K are reported for ice and tetrahydrofuran hydrate and compared with literature values.
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