physics

William Prout

William Prout is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand William Prout rather than just read about it. In short: William Prout FRS (; 15 January 1785 – 9 April 1850) was an English chemist, physician, and natural theologian. He is known for proposing the Prout's hypothesis.

Key takeaways

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Reference excerpt

William Prout FRS (; 15 January 1785 – 9 April 1850) was an English chemist, physician, and natural theologian. He is known for proposing the Prout's hypothesis.

Biography Prout was born in Horton, Gloucestershire in 1785 and educated at 17 years of age by a clergyman, followed by the Redland Academy at Bristol and Edinburgh University, where he graduated in 1811 with an MD. His professional life was spent as a practising physician in London, but he also occupied himself with chemical research. He was an active worker in biological chemistry and carried out many analyses of the secretions of living organisms, which he believed were produced by the breakdown of bodily tissues. In 1823, he discovered that stomach juices contain hydrochloric acid, which can be separated from gastric juice by distillation. In 1827, he proposed the classification of substances in food into sugars and starches, oily bodies, and albumen, which would later become known as carbohydrates, fats, and proteins.

Prout is known for his research in physical chemistry. In 1815, based on the tables of atomic weights available at the time, he anonymously hypothesized that the atomic weight of every element is an integer multiple of that of hydrogen, suggesting that the hydrogen atom is the only truly fundamental particle (which he called protyle), and that the atoms of the other elements are made of groupings of various numbers of hydrogen atoms. While Prout's hypothesis was not borne out by later more-accurate measurements of atomic weights, it was a sufficiently fundamental insight into the structure of the atom that in 1920, Ernest Rutherford chose the name of the newly discovered proton to, among other reasons, give credit to Prout. Prout contributed to the improvement of the barometer, and the Royal Society of London adopted his design as a national standard. He was elected a Fellow of the Royal Society in 1819. He delivered the Goulstonian Lecture to the Royal College of Physicians in 1831 on the application of chemistry to medicine. Prout wrote the eighth Bridgewater Treatise, Chemistry, Meteorology, and the Function of Digestion, considered with reference to Natural Theology. It was in this work that he coined the term "convection" to describe a type of energy transfer. In 1814, Prout married Agnes Adam, daughter of Alexander Adam, of Edinburgh, Scotland, and together they had six children. Prout died in London in 1850 and was buried in Kensal Green Cemetery. The "Prout" is a unit of nuclear binding energy, and is 1/12 the binding energy of the deuteron, or 185.5 keV. It is named after William Prout. "Proutons" was an early candidate for the name of what are now called protons.

Honours and awards Fellow of the Royal Society (1819) Copley Medal (1827) Fellow of the Royal College of Physicians (1829)

Bibliography

Anonymous (Prout, William) (1815). "On the Relation between the Specific Gravities of Bodies in their Gaseous State and the Weights of their Atoms". Annals of Philosophy. 6: 321–330. Prout, William (1816). "Correction of a Mistake in the Essay on the Relation between the Specific Gravities of Bodies in their Gaseous State and the Weights of their Atoms". Annals of Philosophy. 7: 111–113. Prout, William (1825). An Inquiry into the Nature and Treatment of Diabetes, Calculus, and Other Affections of the Urinary Organs (2 ed.). London: Baldwin, Craddock, and Joy. William Prout. Prout, William (1834). Chemistry, Meteorology, and the Function of Digestion Considered with Reference to Natural Theology; Bridgewater Treatises, W. Pickering (reissued by Cambridge University Press, 2009; ISBN 978-1-108-00066-6) Prout, William (1849). On the Nature and Treatment of Stomach and Urinary Diseases (3 ed.). London: John Churchill. William Prout. Prout, William (1947). Prout's hypothesis. Edinburgh: Livingstone.

See also Earl of Bridgewater (for other Bridgewater Treatises) Atomic number

Notes

References This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Prout, William". Encyclopædia Britannica. Vol. 22 (11th ed.). Cambridge University Press. p. 491.

Further reading Ahrens, Richard (1 January 1977). "William Prout (1785–1850) A Biographical Sketch". The Journal of Nutrition. 107 (1): 15–23. doi:10.1093/jn/107.1.15. PMID 319206. Retrieved 6 March 2008. Benfey, O. Theodore (1952). "Prout's Hypothesis". Journal of Chemical Education. 29 (2): 78–81. Bibcode:1952JChEd..29...78B. doi:10.1021/ed029p78. S2CID 4066298. Brock, W. H. (1963). "Prout's Chemical Bridgewater Treatise". Journal of Chemical Education. 40 (12): 652–655. Bibcode:1963JChEd..40..652B. doi:10.1021/ed040p652. Brock, W. H. (1 April 1965). "The Life and Work of William Prout". Medical History. 9 (2): 101–126. doi:10.1017/s0025727300030386. PMC 1033468. PMID 14309114. Brock, W. H. (1985). From Protyle to Proton. Bristol, England: Adam Hilger Ltd. ISBN 978-0-85274-801-5. Copeman, W. S. C. (1970). "William Prout, M.D., F.R.S. Physician and Chemist (1785–1850)". Notes and Records of the Royal Society of London. 24 (2): 273–280. doi:10.1098/rsnr.1970.0019. JSTOR 531294. PMID 11609781. Gladstone, Samuel (1947). "William Prout (1785–1850)". Journal of Chemical Education. 24 (10): 478–481. Bibcode:1947JChEd..24..478G. doi:10.1021/ed024p478. Rosenfeld, Louis (2003). "William Prout: Early 19th Century Physician-Chemist". Clinical Chemistry. 49 (4): 699–705. doi:10.1373/49.4.699. PMID 12651838. Siegfried, Robert (1956). "The Chemical Basis for Prout's Hypothesis". Journal of Chemical Education. 33 (6): 263–266. Bibcode:1956JChEd..33..263S. doi:10.1021/ed033p263. The Semiempirical Formula for Atomic Masses

Illustrations

William Prout: Different species of urinary calculi noted by William Prout[5] — Different species of urinary calculi noted by William Prout[5]

Worked examples

Example 1 — a first encounter with William Prout

Start with the simplest possible case. Write down what William Prout claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to William Prout before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about William Prout ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of William Prout

In research: William Prout appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses William Prout in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: William Prout is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1785 births, 1850 deaths, 18th-century English people, so understanding it makes those chapters shorter.
In everyday life: Look for William Prout outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study William Prout in 20 minutes

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Frequently asked questions

What is William Prout in simple terms?

William Prout FRS (; 15 January 1785 – 9 April 1850) was an English chemist, physician, and natural theologian. He is known for proposing the Prout's hypothesis.

Why does William Prout matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study William Prout?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on William Prout.