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About caloric theory
The caloric theory is a superseded scientific theory that heat consists of a self-repellent fluid called "caloric" that flows from hotter bodies to colder bodies. Caloric was also thought of as a weightless gas that could pass in and out of pores in solids and liquids. The caloric theory was superseded by the mid-19th century in favor of the mechanical equivalent of heat, but nevertheless persisted in some scientific literature—particularly in more popular treatments—until the end of the 19th century.
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