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Jean Perrin's argument for the existence of molecules on the basis of his experiments with Brownian motion is examined. It is also argued, against antirealist interpretations of Perrin, that Perrin himself was applying a realist argument to the existence of unobservable molecules rather than an instrumentalist one to the truth of the observational consequences of the molecular theory.
This pattern of motion typically consists of random fluctuations in a particle's position inside a fluid sub-domain, followed by a relocation to another sub-domain. Each relocation is followed by more fluctuations within the new closed volume. This pattern describes a fluid at thermal equilibrium , defined by a given temperature. Within such a fluid, there exists no preferential direction of flow as in transport phenomena. More specifically, the fluid's overall linear and angular momenta remain null over time.
Perrin gave a detailed account of his work upon the distribution in fluids of small particles, which show the Brownian movement, and the bearing of these results on the kinetic theory of matter. An interesting survey is first given of the historical development cf this subject. The English naturalist, Brown, directed attention in to the fact that small particles suspended in liquids were always in a state of rapid but irregular movement.
Comparatively little notice was paid to this observation until , when Gouy showed that the Brownian movement could not be ascribed to temperature differences,but was a persistent effect which was probably a necessary consequence of the kinetic theory of matter.
Since that time a large amount of interesting work has been done, especially by Continental workers, to throw further light on the magnitude and nature of the Brownian movement.
By Prof. Jean Perrin. London: Taylor and Francis, Reprints and Permissions. Brownian Movement and Molecular Reality. Nature 86, Download citation. Issue Date : 23 March International Journal of Theoretical Physics By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: In the first decade of the 20th century, nearly a hundred years of work on the phenomenon of Brownian motion culminated in theory and experiments that demonstrated irrefutably the discontinuous or molecular nature of matter. Colloidal suspensions and the phenomenon of Brownian motion thus became the key to confirmation of the 'new world-view' of statistical mechanics, the statistical basis of thermodynamics.
Don't have an account? Jean Perrin's argument for the existence of molecules on the basis of his experiments with Brownian motion is examined. It is also argued, against antirealist interpretations of Perrin, that Perrin himself was applying a realist argument to the existence of unobservable molecules rather than an instrumentalist one to the truth of the observational consequences of the molecular theory. Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter. Please, subscribe or login to access full text content. To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us.
Brownian Movement and Molecular Reality PDF. Download PDF. This work has been selected by scholars as being culturally important and is part of the.
They did succeed in determining mean kinetic energies of particles in Brownian motion, but the values for molecular magnitudes Perrin inferred from them simply presupposed that those energies match the mean kinetic energies of molecules in the surrounding fluid. This presupposition became increasingly suspect between This presupposition became increasingly suspect between and as distinctly different values for these magnitudes were obtained from alpha-particle emissions by Rutherford et al. Moreover, though Planck in had proposed turning to complementary theory-mediated measurements of interlinked molecular magnitudes as a source of evidence, it was Perrin more than anyone else who championed this approach. The concerted efforts of Rutherford, Millikan, Planck, Perrin, and their colleagues during the years in question led to evidence of this form becoming central to microphysics.
Compendium of Quantum Physics pp Cite as. Brownian motion is the irregular and perpetual agitation of small particles suspended in a liquid or gas. In the Scottish botanist Robert Brown — published the first extensive study of the phenomenon.
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The story told has some rather interesting repercussions for the rationality of accepting the reality of explanatory posits. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve.
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BROWNIAN MOVEMENT AND MOLECULAR REALITY. By M. JEAN PERRIN. (Professeur de Chimie Physique, Faculte des Sciences,. Universite de Paris.).Felicia O. 20.12.2020 at 18:36
Brownian Movement and Molecular Reality. By Prof. M. Jean Perrin. Translated from the "Annales de Chimie et de Physique", 8me Series, September,Greg P. 20.12.2020 at 22:00
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