|Charles Brian Blagden|
|Born||17 April 1748
|Known for||Studies of perspiration and the freezing point of solutions|
|Notable awards||Copley Medal|
Sir Charles Brian Blagden FRS (17 April 1748 – 1820) was a British physician and scientist. He served as a medical officer in the Army (1776 – 1780) and later held the position of Secretary of the Royal Society (1784 – 1797). Blagden won the Copley Medal in 1788 and was knighted in 1792.
In June 1783, Blagden, then assistant to Henry Cavendish, visited Antoine Lavoisier in Paris and described how Cavendish had created water by burning "inflammable air". Lavoisier's dissatisfaction with the Cavendish's "dephlogistinization" theory led him to the concept of a chemical reaction, which he reported to the Royal Academy of Sciences on 24 June 1783, effectively founding modern chemistry.
Blagden's experiments on how dissolved substances like salt affected the freezing point of water led to the discovery that the freezing point of a solution decreases in direct proportion to the concentration of the solution, now called Blagden's Law. (See: Freezing-point depression)
- For a summary of Blagden's life and work, see Jungnickel, Christa; McCormmach, Russell (1996). Cavendish. Philadelphia: American Philosophical Society. pp. 212–216. ISBN 0-87169-220-1.
- Wilson, George (1851). The Life of the Hon. Henry Cavendish. London: Harrison and Son. p. 131.
- Brougham, Henry Lord (1839). "Historical Account of the Discovery of the Composition of Water". The Edinburgh New Philosophical Journal 27 (54): 316–324.
- Blagden, Charles (1775). "Experiments and Observations in an Heated Room". Philosophical Transactions (1683-1775) 65: 111–123. doi:10.1098/rstl.1775.0013.
- Blagden, Charles (1775). "Further Experiments and Observations in an Heated Room". Philosophical Transactions (1683-1775) 65: 484–494. doi:10.1098/rstl.1775.0048.
- Mellor, Joseph William (1912). Modern Inorganic Chemistry. New York: Longmans, Green, and Company. p. 161.
- Blagden, Charles (1781). "On the Heat of the Water in the Gulf-Stream". Philosophical Transactions 71: 334–344. doi:10.1098/rstl.1781.0042. JSTOR 106528.
- Blagden, Charles (1903). "Letters from Sir Charles Blagden to Sir Joseph Banks on American Natural History and Politics, 1776 - 1786". Bulletin of the New York Public Library 7.
- Fauque, Danielle M. E. (Dec. 2008). "An Englishman Abroad: Charles Blagden's Visit to Paris in 1783". Notes and Records of the Royal Society of London (England) 62 (4): 373–90. doi:10.1098/rsnr.2008.0041. ISSN 0035-9149. PMID 19244920.
- Heberden, E. (April 1985). "Correspondence of William Heberden, F.R.S. with the Reverend Stephen Hales and Sir Charles Blagden". Notes and Records of the Royal Society of London (England) 39 (2): 179–89. doi:10.1098/rsnr.1985.0008. ISSN 0035-9149. PMID 11611813.
- Hill, B. (July 1976). "In War and Peace Sir Charles Blagden, M.D.Ed., F.R.S. (1748-1820)". The Practitioner (England) 217 (1297): 126–31. ISSN 0032-6518. PMID 792860.
- De Beer, G. (1954). "Sir Charles Blagden's First Visit to Switzerland". Gesnerus 11 (1-2): 17–35. ISSN 0016-9161. PMID 13232299.
- Blagden Papers at the Royal Society
- Portrait of Sir Charles Blagden by Mary Dawson Turner (National Portrait Gallery)
- National Public Radio story about Blagden