Search results
Jean Perrin maintained that if molecules were real, particles blended into a liquid should not all sink to the bottom but should distribute themselves throughout the liquid. In 1908 he could substantiate this through experimentation.
- Introduction
- The Brownian Movement
- Extension of The Gas Laws to Emulsions
- Law of The Vertical Distribution of An Emulsion
- Non-Diluted Emulsions
- Measurements of The Brownian Movement
- The Molecular Reality
- Monomolecular Films
- The Discontinuous Structure of The Atom
A fluid such as air or water seems to us at first glance to be perfectly homogeneous and continuous; we can put more water or less water into this glass, and the experiment seems to suggest to us that the amount of water contained in it can vary by an infinitely small amount, which is the same as saying that water is “indefinitely divisible”. Simil...
Let us consider a liquid in equilibrium: the water contained in this glass, for example. It appears to us homogeneous and continuous, and immobile in all its parts. If we place in it a denser object, it falls, and we know quite well that once it has arrived at the bottom of the glass, it stays there and is unlikely to ascend again “by itself”. We c...
I must, first of all, recall how the gas laws and particularly Avogadro’s law came to be regarded, thanks to Van ‘t Hoff, as applicable to dilute solutions. The pressure exerted by a gas on the walls limiting its expansion becomes, for a dissolved substance, the osmotic pressure exerted on semi-permeablewalls which allow the solvent to pass, but ho...
We all know that air is more rarefied at the top of a mountain than at sea level and, generally speaking, he pressure of air has to diminish as one goes higher since this pressure has then to carry only a smaller part of the atmosphere which applies its weight against the earth. If we specify this slightly vague reasoning in the Laplace manner, we ...
Proceeding then further in tracing the similarities between liquids and emulsions, I was able to show (1913) that a non-diluted emulsion is comparable to a compressed liquid of which the molecules would be visible. For this purpose it was necessary to determine the osmotic pressure as a function of the concentration when the gas laws cease to be ap...
The equilibrium distribution of an emulsion is due to the Brownian movement, and the more rapidly as this movement is more active. But this rapidity is not important for the final distribution. In fact, as we have just seen, I also studied the distribution first on the permanent state without making any measurement on the Brownian movement. But by ...
Briefly, and in spite of the variety of experimental conditions and techniques, the study of the emulsions gave me for Avogadro’s number: or, as a crude average, 64 x 1022. I can recall here that on the other hand, considering gases as consisting of molecules which diffract light (Rayleigh, Smoluchovski, Einstein) it was possible to obtain (somewha...
I encountered this phenomenon (1913) by observing under the microscope small laminae of “soapy water”, and in such simple conditions that it is surprising it was not discovered earlier. You know the properties of thin laminae: each ray reflected from such a lamina is formed by the superposition of a ray reflected from the front side of the lamina o...
Even whilst evidence continued to accumulate on the still disputed atomic reality, a start was made to penetrate the interior structure of these atoms, a research in which Rutherford and Bohrobtained marvellous results, as we know. And I must summarize here my contribution to this research. It was known that when an electric discharge passes in a g...
May 18, 2018 · French physicist Jean Baptiste Perrin (1870-1942) helped to prove that atoms and molecules exist, an achievement that earned him the 1926 Nobel Prize in physics. Jean Baptiste Perrin was born in Lille, France, on September 30, 1870, and raised, along with two sisters, by his widowed mother.
Feb 16, 2004 · In 1909 Perrin reported an estimate of Avogadro’s number based on his work on Brownian motion—the random movement of microscopic particles suspended in a liquid or gas.
Research and achievements. Jean Perrin in 1908. In 1895, Perrin showed that cathode rays were of negative electric charge in nature. He determined the Avogadro constant by several methods. He explained solar energy as due to the thermonuclear reactions of hydrogen.
The French physicist Jean Baptiste Perrin is widely credited with providing the conclusive argument for atomism. The most well-known part of Perrin’s argument is his description of thirteen different procedures for determining Avogadro’s number (N)–the number of atoms, ions,
People also ask
How did Perrin contribute to science?
How did Jean Perrin prove a real molecule?
Who was Jean Baptiste Perrin?
How did Perrin explain solar energy?
his granules Perrin even succeeded in determining the number of molecules in a ‘grammolecule’, today’s mole (6.7·10 23). Perfectly conscious of the importance of his find, Perrin took the liberty to call it after the Italian gas specialist Amedeo Avogadro (1776-1856). The new light: nothing but phyics
