1.3.10: Calorimetry- Solutions- Flow Microcalorimetry

An important event in experimental calorimetry was the development of the Picker flow microcalorimeter [1-3]. In this calorimeter, two liquids [e.g. water(\(\lambda\)) and an aqueous solution] at the same temperature flow through two cells. The liquids are heated, the calorimeter recording the difference in power required to keep both liquids at the same temperature. The recorded difference is a function of the difference in isobaric heat capacities per unit volume. The isobaric heat capacity of the solvent [e.g. water(\(\lambda\))] per unit volume (or, heat capacitance) , \(\sigma^{*}(\lambda)\) is the reference. The technique has been extended to measure enthalpies and rates of reaction [4].

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