A flow calorimeter for enthalpies of mixing. The enthalpy of mixing of <i>n</i>-hexane + cyclohexane at 298.15 K

A new flow calorimeter for measurements of enthalpies of mixing is described. It has been used to make a series of measurements on <i>n</i>-hexane + cyclohexane at 298.15 K with a view to recommending that pair of liquids for checking new calorimeters. The results, including the present ones, obtained as the result of an international cooperative effort in five different laboratories with five quite different calorimeters, reveal no systematic discrepancies and establish the enthalpy of mixing at 298.15 K with a certainty unprecedented in this field. A few measurements have also been made at 313.15 K.