Percy Williams Bridgman

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Percy Williams Bridgman (April 21, 1882 – August 20, 1961) was an American physicist who received the Nobel Prize in Physics in 1946 for his work on the physics of high pressures. He also wrote extensively on the scientific method and on other aspects of the philosophy of science.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> The Bridgman effect, the Bridgman–Stockbarger technique, and the high-pressure mineral bridgmanite are named after him.

Biography

Early life

Bridgman was born in Cambridge, Massachusetts, and grew up in nearby Auburndale.<ref name="Kemble">Template:Cite book</ref>

Bridgman's parents were both born in New England. His father, Raymond Landon Bridgman, was "profoundly religious and idealistic" and worked as a newspaper reporter assigned to state politics. His mother, Mary Ann Maria Williams, was described as "more conventional, sprightly, and competitive".<ref name="Kemble"/>

Bridgman attended both elementary and high school in Auburndale, where he excelled at competitions in the classroom, on the playground, and while playing chess. Described as both shy and proud, his home life consisted of family music, card games, and domestic and garden chores. The family was deeply religious; reading the Bible each morning and attending a Congregational Church.<ref name="Kemble"/> However, Bridgman later became an atheist.<ref>Ray Monk (2013). Robert Oppenheimer: A Life Inside the Center. Random House LLC. Template:ISBN. In many ways they were opposites; Kemble, the theorist, was a devout Christian, while Bridgman, the experimentalist, was a strident atheist.</ref>

Education and professional life

Bridgman entered Harvard University in 1900, and studied physics through to his PhD. From 1910 until his retirement, he taught at Harvard, becoming a full professor in 1919. In 1905, he began investigating the properties of matter under high pressure. A machinery malfunction led him to modify his pressure apparatus; the result was a new sealing device enabling him to create pressures eventually exceeding 100,000 kgf/cm2 (10 GPa; 100,000 atmospheres). This was a huge improvement over previous machinery, which could achieve pressures of only 3,000 kgf/cm2 (0.3 GPa).<ref>Template:Cite web</ref> This new apparatus led to an abundance of new findings, including a study of the compressibility, electric and thermal conductivity, tensile strength and viscosity of more than 100 different compounds.Template:Citation needed Bridgman is also known for his studies of electrical conduction in metals and properties of crystals. He developed the Bridgman seal and is the eponym for Bridgman's thermodynamic equations, which were used to further his research.

Bridgman made many improvements to his high-pressure apparatus over the years, and unsuccessfully attempted the synthesis of diamond many times.<ref>Template:Citation</ref> The high-pressure torsion apparatus developed by Bridgman <ref>Template:Cite journal</ref> significantly contributed to the development of severe plastic deformation field decades later.<ref>Template:Cite journal</ref>

His philosophy of science book The Logic of Modern Physics (1927) advocated operationalism and coined the term operational definition. In 1938 he participated in the International Committee composed to organise the International Congresses for the Unity of Science.<ref>Template:Cite journal</ref> He was also one of the 11 signatories to the Russell–Einstein Manifesto.

J. Robert Oppenheimer, the director of the Manhattan Project, was an undergraduate student of Bridgman's. Of his teaching abilities, Oppenheimer said that, “I found Bridgman a wonderful teacher because he never really was quite reconciled to things being the way they were and he always thought them out.”<ref>Template:Cite book</ref>

Home life and death

Bridgman with wife and Gustaf VI Adolf of Sweden in Stockholm in 1946

Bridgman married Olive Ware (1882-1972), of Hartford, Connecticut, in 1912. Ware's father, Edmund Asa Ware, was the founder and first president of Atlanta University. The couple had two children and were married for nearly 50 years, living most of that time in Cambridge. The family also had a summer home in Randolph, New Hampshire, where Bridgman was known as a skilled mountain climber.<ref name="Kemble"/>

Bridgman was a "penetrating analytical thinker" with a "fertile mechanical imagination" and exceptional manual dexterity. He was a skilled plumber and carpenter, known to shun the assistance of professionals in these matters. He was also fond of music and played the piano, and took pride in his flower and vegetable gardens.<ref name="Kemble"/>

Bridgman committed suicide by gunshot after suffering from metastatic cancer for some time. His suicide note was a mere two sentences; "It isn't decent for society to make a man do this thing himself. Probably this is the last day I will be able to do it myself."<ref>Template:Cite journal</ref><ref>Template:Cite book</ref> Bridgman's words have been quoted by many in the assisted suicide debate.<ref>Ayn Rand Institute discussion on assisted suicide. Aynrand.org; retrieved January 28, 2012.</ref><ref>Euthanasia Research and Guidance Organization. Assistedsuicide.org (June 13, 2003); retrieved 2012-01-28.</ref>

Honors and awards

Bridgman received Doctors, honoris causa from Stevens Institute (1934), Harvard (1939), Brooklyn Polytechnic (1941), Princeton (1950), Paris (1950), and Yale (1951). He received the Bingham Medal (1951) from the Society of Rheology, the Rumford Prize from the American Academy of Arts and Sciences (1919), the Elliott Cresson Medal (1932) from the Franklin Institute, the Gold Medal from Bakhuys Roozeboom Fund (founder Hendrik Willem Bakhuis Roozeboom) (1933) from the Royal Netherlands Academy of Arts and Sciences,<ref>Template:Cite web</ref> the Comstock Prize (1933) of the National Academy of Sciences,<ref name=Comstock>Template:Cite web</ref> and the 1946 Nobel Prize in Physics.<ref>Template:Cite web</ref>

Bridgman was a member of the American Physical Society and was its president in 1942. He was also a member of the American Association for the Advancement of Science, the American Academy of Arts and Sciences, the American Philosophical Society, and the National Academy of Sciences. He was a Foreign Member of the Royal Society and Honorary Fellow of the Physical Society of London.Template:Citation needed

The Percy W. Bridgman House, in Massachusetts, is a U.S. National Historic Landmark designated in 1975.<ref name="nrhpinv2">Template:Citation and Template:NHLS url Template:Small</ref>

In 2014, the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association approved the name bridgmanite for perovskite-structured Template:Chem2,<ref>Page on bridgmanite, mindat.org; retrieved June 3, 2014.</ref><ref>Tschauner, O., Ma, C., Beckett, J.R., Prescher, C., Prakapenka, V.B., Rossman, G.R. (2014) Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite. Science: 346: 1110-1112. doi:10.1126/science.1259369</ref>the Earth's most abundant mineral,<ref name="Murakami_2007">Template:Cite journal</ref> in honor of his high-pressure research.

Bibliography

See also

References

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Further reading

  • Walter, Maila L., 1991. Science and Cultural Crisis: An Intellectual Biography of Percy Williams Bridgman (1882–1961). Stanford Univ. Press.
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