upright=1.2|thumb|The world's first ice-calorimeter, used in the winter of 1782–83, by Antoine Lavoisier and [[Pierre-Simon Laplace, to determine the heat involved in various chemical changes; calculations which were based on Joseph Black's prior discovery of latent heat. These experiments mark the foundation of thermochemistry.]] thumb|upright|Snellen direct calorimetry chamber, University of Ottawa thumb|Indirect calorimetry metabolic cart measuring oxygen uptake and production of a spontaneously breathing subject (dilution method with canopy hood).
upright=1.2|thumb|The world's first ice-calorimeter, used in the winter of 1782–83, by Antoine Lavoisier and [[Pierre-Simon Laplace, to determine the heat involved in various chemical changes; calculations which were based on Joseph Black's prior discovery of latent heat. These experiments mark the foundation of thermochemistry.]] thumb|upright|Snellen direct calorimetry chamber, University of Ottawa thumb|Indirect calorimetry metabolic cart measuring oxygen uptake and production of a spontaneously breathing subject (dilution method with canopy hood).
In chemistry and thermodynamics, calorimetry () is the science or act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due, for example, to chemical reactions, physical changes, or phase transitions under specified constraints. Calorimetry is performed with a calorimeter. Scottish physician and scientist Joseph Black, who was the first to recognize the distinction between heat and temperature, is said to be the founder of the science of calorimetry.
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