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Brownian Movement And Molecular Reality Pdf

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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. The final two chapters of this book invoke case histories in physics: the discovery of the electron, credited to J.

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.

Brownian motion

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.

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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. The analysis here of how this came about replaces an untenable legend with an account that is not only tenable, but far more instructive about what the evidence did and did not show. Keywords: Brownian motion , theory-mediated measurement , molecular magnitudes , agreeing measurement , molecular reality , Jean Perrin.


Brownian Movement and Molecular Reality PDF. Download PDF. This work has been selected by scholars as being culturally important and is part of the.


Brownian movement and molecular reality

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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.

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2 Comments

Sydney C. 14.05.2021 at 17:37

BROWNIAN MOVEMENT AND MOLECULAR REALITY. By M. JEAN PERRIN. (​Professeur de Chimie Physique, Faculte des Sciences,. Universite de Paris.).

Byron D. 18.05.2021 at 03:26

Brownian Movement and Molecular Reality. By Prof. M. Jean Perrin. Translated from the "Annales de Chimie et de Physique", 8me Series, September,

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