The scientific principles governing how dissolved substances lower the freezing point of water bear the name of Charles Blagden, a physician who bridged the gap between eighteenth-century medical practice and fundamental chemical discovery. Throughout his career, he balanced high-level administrative service to the Royal Society with pioneering inquiries into human physiology and the chemical composition of matter.
Early Education and Military Service
Born in 1748 in Wooten-under-Edge, Gloucestershire, to John Blagden and Elizabeth Phelps, Charles Blagden did not follow a traditional path through public schooling. He studied medicine at the University of Edinburgh, earning his medical degree in 1768. Following his graduation, he entered military service in 1776, serving as an army surgeon. His deployment included duty on the hospital ship HMS Pigot during the American War of Independence, followed by a medical post in Plymouth in 1780.
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In 1775, Blagden conducted notable experiments regarding human thermoregulation. He demonstrated that individuals could endure environments as hot as 260 degrees Fahrenheit, or 127 degrees Celsius. His report to the Royal Society detailed these observations, marking the first time a Western scientist formally identified the role of perspiration in maintaining stable human body temperatures under extreme heat stress.
Scientific Collaboration and Administration
After leaving military duty, Blagden moved to London in late 1782 to serve as an assistant to Henry Cavendish. In this role, he played a crucial part in the dissemination of chemical theory. During a visit to Paris in 1783, he communicated to Antoine Lavoisier how Cavendish had synthesized water through the combustion of inflammable air, a finding that catalyzed modern chemical understanding. Blagden later served as Secretary of the Royal Society from 1784 to 1797.
Professional Honors and Final Years
Blagden received significant recognition for his scholarly contributions, including the Copley Medal in 1788 and a knighthood in 1792. He held memberships in numerous organizations, such as the French Academy of Sciences, the American Academy of Arts and Sciences, and the American Philosophical Society. He died in 1820 while in Arcueil, France, and was subsequently buried at the Père Lachaise Cemetery in Paris.
Fast facts
- Born: 1748, Wooten-under-Edge, Gloucestershire
- Died: 1820, Arcueil, France
- Education: University of Edinburgh
- Key Award: Copley Medal, 1788
- Military Role: Army surgeon, 1776-1780
- Royal Society Secretary: 1784-1797
- Burial: Père Lachaise Cemetery, Paris
Questions readers ask
What is Blagden's Law?
It is the observation that the freezing point of a solution decreases in direct proportion to the concentration of the dissolved substance.
Which major scientific societies did he join?
He was a fellow of the Royal Society and a member of the French Academy of Sciences, the American Academy of Arts and Sciences, the American Philosophical Society, and the Bavarian Academy of Sciences and Humanities.
Achievements
- Copley Medal — 1788
- Fellow of the Royal Society
