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Sidelights on Relativity - Albert Einstein
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ISBN: 9781412183888

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An Address delivered on May 5th, 1920, in the University of Leyden How does it come about that alongside of the idea of ponderable matter, which is derived by abstraction from everyday life, the physicists set the idea of the existence of another kind of matter, the ether? The explanation is probably to be sought in those phenomena which have given rise to the theory of action at a distance, and in the properties of light which have led to the undulatory theory. Let us devote a little while to the consideration of these two subjects. Outside of physics we know nothing of action at a distance. When we try to connect cause and effect in the experiences which natural objects afford us, it seems at first as if there were no other mutual actions than those of immediate contact, e.g. the communication of motion by impact, push and pull, heating or inducing combustion by means of a flame, etc. It is true that even in everyday experience weight, which is in a sense action at a distance, plays a very important part. But since in daily experience the weight of bodies meets us as something constant, something not linked to any cause which is variable in time or place, we do not in everyday life speculate as to the cause of gravity, and therefore do not become conscious of its character as action at a distance. It was Newtons theory of gravitation that first assigned a cause for gravity by interpreting it as action at a distance, proceeding from masses. Newtons theory is probably the greatest stride ever made in the effort towards the causal nexus of natural phenomena. And yet this theory evoked a lively sense of discomfort among Newtons contemporaries, because it seemed to be in conflict with the principle springing from the rest of experience, that there can be reciprocal action only through contact, and not through immediate action at a distance. It is only with reluctance that mans desire for knowledge endures a dualism of this kind. How was unity to be preserved in his comprehension of the forces of nature? Either by trying to look upon contact forces as being themselves distant forces which admittedly are observable only at a very small distance - and this was the road which Newtons followers, who were entirely under the spell of his doctrine, mostly preferred to take, or by assuming that the Newtonian action at a distance is only apparently immediate action at a distance, but in truth is conveyed by a medium permeating space, whether by movements or by elastic deformation of this medium. Thus the endeavour toward a unified view of the nature of forces leads to the hypothesis of an ether. This hypothesis, to be sure, did not at first bring with it any advance in the theory of gravitation or in physics generally, so that it became customary to treat Newtons law of force as an axiom not further reducible. But the ether hypothesis was bound always to play some part in physical science, even if at first only a latent part.

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Two influential essays: "Ether and Relativity" (1920) discusses its subjects' related properties; "Geometry and Experience" (1921) describes Euclidean or other geometric systems in connection with the concept of a finite universe. EBooks, Books~~Reference~~General, Sidelights-on-Relativity~~Albert-Einstein, 999999999, Sidelights on Relativity, Albert Einstein, 141218388X, eBooksLib, , , , , eBooksLib

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Sidelights on Relativity Reference, Reference & Language, Sidelights on Relativity~~ Albert Einstein~~Reference~~Reference & Language~~9781412183888, en, Sidelights on Relativity, Albert Einstein, 9781412183888, eBooksLib, 07/24/2015, , , , eBooksLib, 07/24/2015

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[KW: BELLETRISTIK,HAUPTWERK VOR 1945 ,CLASSIC LITERATURE] BELLETRISTIK,HAUPTWERK VOR 1945 ,CLASSIC LITERATURE

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Sidelights on Relativity
Auteur:

Albert Einstein

Titre:

Sidelights on Relativity

ISBN:

9781412183888

Informations détaillées sur le livre - Sidelights on Relativity


EAN (ISBN-13): 9781412183888
Date de parution: 2009
Editeur: eBooksLib

Livre dans la base de données depuis 18.02.2014 15:36:18
Livre trouvé récemment le 15.06.2016 19:11:18
ISBN/EAN: 9781412183888

ISBN - Autres types d'écriture:
978-1-4121-8388-8

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