Synthesized answer
In 1908, Lewis’s reaffirmation of the conservation of mass and energy was historically significant because recent experiments—such as those showing the mass of an electron changing with speed and the phenomenon of radioactivity—had created doubt about the validity of these fundamental laws [1]. Lewis aimed to construct a “simple system of mechanics” that was consistent with all known experimental facts and rested on the truth of the three great conservation laws: energy, mass, and momentum [1]. This was a direct response to the scientific landscape where Newtonian mechanics, unchanged since Newton, seemed threatened by new evidence [2].
By retaining the conservation laws while modifying the Newtonian axiom that mass is independent of velocity, Lewis showed that mass increases with kinetic energy [5]. His system produced equations that agreed with Kaufmann’s experiments on electron mass and were similar to equations for electromagnetic mass [3]. Crucially, he argued that although a body gains mass as it gains kinetic energy, “some other system is losing the same mass as it loses the same energy,” thus preserving the conservation of mass and energy together [4]. This reaffirmation…
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From the book
ose fundamental principles of the mechanics of ponderable matter which have remained unaltered since the time of Newton. The recent experiments which indicate a change in the mass of an electron with the speed, together with the phenomenon of radioactivity, have in some minds created a doubt as to the exact validity of some of the most general laws of nature. In the following pages I shall attempt to show that we may construct a simple system of mechanics which is consistent with all known experimental facts, and which rests upon the assumption of the truth of the three great conservation…
← A revision of the Fundamental Laws of Matter and Energy ( 1908 ) by Gilbert Newton Lewis → related portals : Relativity Philosophical Magazine, 1908, 6 16 (95): 705-717, Online 412006 A revision of the Fundamental Laws of Matter and Energy 1908 Gilbert Newton Lewis THE LONDON, EDINBURGH, AND DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [SIXTH SERIES.] NOVEMBER 1908. LIX. A Revision of the Fundamental Laws of matter and Energy. By Gilbert N. Lewis . Ph.D., Associate Professor of Physical Chemistry, Massacussets Institute of Technology, Boston . R ECENT publications of Einstein and…
an mechanics and assuming the conservation laws of mass, energy, and momentum, a new system of mechanics is constructed. In this system momentum is mv , kinetic energy varies between 1/2 mv² at low velocity and mv² at the velocity of light, while the mass of a body is a function of the velocity and becomes infinite at the velocity of light. The equation obtained agrees with the experiments of Kaufmann on the relation between the mass of an electron and its velocity. It is, moreover, strikingly similar to the equations that have been obtained for electromagnetic mass. The new view leads to an…
echanics. But they have been so chosen as to be consistent also with equation (7) and the fundamental conservation laws. Obviously equation (7) itself is not inconsistent with these conservation laws, for although a body increases in mass as it gains kinetic energy, some other system is losing the same mass as it loses the same energy. In accordance with the above definitions we may write d M = f d t {\displaystyle d\mathrm {M} =fdt} , (11) d E ′ = f d l {\displaystyle d\mathrm {E} '=fdl} . (12) Let us consider a body originally moving with a velocity v subjected for the time dt to a force f…
y motion imparted to it increases its mass, or when a certain force will give it the same acceleration in any direction. It is true that metaphysicians hold that in the strictest sense absolute motion is not only unknowable but unthinkable, but we may say at least that the above method permits theoretically the detection of absolute translational motion in the same sense that a study of centrifugal forces enables us to detect absolute rotational motion. Summary . It is postulated that the energy and momentum of a beam of radiation are due to a mass moving with the velocity of light. From this…
More questions about this book
- Lewis states his intention to "modify those fundamental principles of the mechanics of ponderable matter which have remained unaltered since the time of Newton." Explain in your own words what makes such a drastic revision necessary at this time, citing specific experimental and theoretical advancements mentioned in the text.
- The text suggests that phenomena like "a change in the mass of an electron with the speed" and "radioactivity" created doubt about "the exact validity of some of the most general laws of nature." How might these specific observations *appear* to challenge one or more of the "three great conservation laws" Lewis ultimately seeks to uphold?
- Describe the phenomenon of light pressure and how its experimental verification, combined with the law of conservation of momentum, "inevitably leads" to the conclusion that a beam of light possesses momentum. Why is this particular insight crucial for Lewis's revision of fundamental laws?
- Considering Lewis's 1908 publication date and his reference to Einstein, how does this "revision of the Fundamental Laws of Matter and Energy" reflect the broader conceptual revolution in physics occurring at the beginning of the 20th century? What previously held assumptions about the nature of matter and energy are being challenged and potentially integrated?