Abstract
The discovery of carbon dioxide by Joseph Black (1728–1799) marked a new era of research on the respiratory gases. His initial interest was in alkalis such as limewater that were thought to be useful in the treatment of renal stone. When he studied magnesium carbonate, he found that when this was heated or exposed to acid, a gas was evolved which he called “fixed air” because it had been combined with a solid material. He showed that the new gas extinguished a flame, that it could not support life, and that it was present in gas exhaled from the lung. Within a few years of his discovery, hydrogen, nitrogen and oxygen were also isolated. Thus arguably Black’s work started the avalanche of research on the respiratory gases carried out by Priestley, Scheele, Lavoisier and Cavendish. Black then turned his attention to heat and he was the first person to describe latent heat, that is the heat added or lost when a liquid changes its state, for example when water changes to ice or steam. Latent heat is a key concept in thermal physiology because of the heat lost when sweat evaporates. Black was a friend of the young James Watt (1736–1819) who was responsible for the development of early steam engines. Watt was puzzled why so much cooling was necessary to condense steam into water, and Black realized that the answer was the latent heat. The resulting improvements in steam engines ushered in the Industrial Revolution.
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B. West, J. (2015). Joseph Black, Carbon Dioxide, Latent Heat, and the Beginnings of the Discovery of the Respiratory Gases. In: Essays on the History of Respiratory Physiology. Perspectives in Physiology. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-2362-5_9
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