Talk:Albert Einstein

Does anyone besides me think that Einsteins observation that the brownian motion of pollen in water, considered the first real proof of the molecular theory of matter, is worth mentioning? --BlackGriffen

What exactly did he observe? Wasn't the Brownian motion known already? --AxelBoldt

Yes. The first well-known publications about it were by a botanist called Brown in the early 19th century. But no-one had a clue why it happened. Einstein's theory of it, backed up by actual mathematics, completely solved the mystery. It also convinced many more conservative scientists that atoms and molecules exist, something they had previously been reluctant to accept, especially in Germany. (Others below have partially answered your question, but i thought not clearly enough.) -- Geronimo Jones

IIRC, it was Einstiens observation that the pollen in a glass of water underwent brownian motion that was consider the proof. I'll post more about it after I double check. --BlackGriffen

It is critically important. It was one of the most-often cited papers of Einstein's in the early part of his career. --RjLesch

Yes, I just checked my source today, and it says that Einstein observed the chaotic motion of pollen in water, and surmised that this was do to the chaotic motion of molecules that caused it. After lab experiments verified his observation, even the staunches detractors of the existance of molecules and atoms admitted their existance. Before then, atoms/molecules were regarded as a useful construct with no concrete evidence behind them. Einstein provided that evidence. --BlackGriffen

D'oh! I just read RjLesch's additions to the main page. My explanation was just a few hours late. --BlackGriffen

Wish I could claim credit, but that wasn't mine. --RjLesch

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A few quick refs:

http://www.matse.psu.edu/matsc81/GLOSSARYold/people14

http://www.bun.kyoto-u.ac.jp/~suchii/einsteinBM

http://www.doc.ic.ac.uk/~nd/surprise_95/journal/vol4/ykl/report

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Since we're adding Einstein's personal/political views, perhaps we should include this quote, "Marriage is nothing more than an attempt to make something lasting out of an incident." I don't know if those were his exact words, but it was very close to that. --BlackGriffen

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THe first paragraph is bit dodgy. I think some Irish physicist was the first to propose Special Relativity before 1895. Possibly called Fitzgerald? Lorenz, Minkowski and others may also have been slightly before Einstein. As far as i know, Einstein was the first with a workable General Relativity, but that came later.

While the particular Lorenz transformations were of course known, Einstein came up with an axiomatic approach to derive them and also with several re-interpretations of fundamental concepts, such as time and size, energy=mass etc.

I believe these parts of special relativity are exclusively his, and they are arguably more important than the transformation laws. --AxelBoldt

Agreed. The Lorenz-FitzGerald contractions were really an attempt to rehabilitate the ether theory; Eistein's conceptual framework was fundamentally different, though it ended up using the same formulae. Lorenz and FitzGerald are nonetheless important figures, as was Minkowski (though the Minkowski spacetime relations were, I believe, published in 1908 as a response to Einstein). --RjLesch.

"His theoretical work suggested the possibility of creating an atomic bomb." I think even this is too strong. Einstein's only contribution to the atomic bomb was political.

I agree.I also think there's a problem with, "More immediately, however, the equation set people to dreaming of explosive weaponry..." E=mc2 is neither necessary nor sufficient to show that a nuclear chain reaction is possible. E=mc2 says that /every/ form of energy is equivalent to mass. This is just as true for chemical reactions as for nuclear reactions. --bcrowell

"He spent his last 20 years in an increasingly isolated and ultimately unsuccessful attempt at constructing a theory that would unify General Relativity and quantum mechanics." Is this correct? I thought he was trying to construct a non-quantum-mechanical theory that would unify all the forces. --bcrowell

Given his distaste for QM, I tend to agree, but I don't know the details. AxelBoldt 00:04 Dec 16, 2002 (UTC)

Isn't the photo copyrighted? As far as I've been able to find out, all the post-1922 photos of Einstein are owned by various organizations. I have a circa-1905 public-domain photo here, [1] (http://www.lightandmatter.com/area1dp), which could replace it. --bcrowell

Yes, I think it would be better to go with the earlier photo. AxelBoldt 00:04 Dec 16, 2002 (UTC)

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My original text:

...the Michelson-Morley experiment, which had shown that light waves could not travel through a medium (other known waves travelled through media - such as water or air). The speed of light was thus fixed, and not relative to the movement of the observer

Heron's version:

...the Michelson-Morley experiment, which had shown that light waves did not require a medium to travel through (other known waves travelled through media - such as water or air). The speed of light was thus fixed, and not relative to the movement of the observer.

This is definitely an improvement in some respects (my prose was not beautiful :), but it's also potentially misleading, because it could be interpreted as saying "MM shows: where there is no medium, there is no light".

I've tried to improve on the original wording, while avoiding the misinterpretation, with "light waves could not be travelling through a medium".

--Pde 08:02 Mar 15, 2003 (UTC)

We are getting closer. How about this: "The MM experiment discredited the theory that light was a disturbance of a hypothetical medium called the luminiferous ether, leading Einstein to conclude that light did not depend on any medium for its propagation and therefore that its speed was fixed."

Perhaps hypothetical medium should be hypothetical, intangible medium. Or something. The point which would be nice to pass along here is that, if you have studied Newtonian physics, any attempt to understand the movement of light will begin by inserting a co-ordinate system to measure it with; this is really all the aether was.

On a related note, I don't think it's enough to say its speed was fixed. In Newtonian physics, speeds are fixed, relative to any yardstick. When you move relative to the yardstick, the speed you see is different (this is intuitive). In SR, the speed is the same regardless of how you are moving. Pde

I think my confusion was partly due to a dual meaning of the word medium: (1) stuff that is required for a signal to propagate, and (2) any transparent or translucent stuff that isn't a vacuum. MM proved that (1) didn't exist, but said nothing about (2). Physicists probably assume meaning (1) when they read this, but hair-splitters like me see both meanings. How am I doing? -- Heron

(1) and (2) are not totally seperate concepts. Your statement of (2) is perhaps incomplete, because what I would expect, if I were a 19th Century physicist, is a medium in the sense of (2) which is the vacuum, and the conductor (1) for electricity and magnetism. This is the "universal co-ordinate system" I mentioned above. -- Pde 01:11 Apr 8, 2003 (UTC)

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I made two corrections to the article. 1) It said Einstein denounced his German citizineship at age of 17. This is incorrect information. He was the director of Kaiser Wilhelm Institute for Physics in Berlin for almost 20 years from 1914 to 1933. 2) The article said "he signed a letter" to FDR regarding development of an atomic bomb programme. Einstein actually wrote that letter himself. It is also noteworthy that he wrote that letter to Roosevel before World War II started.    --Keyvan 03:25 Apr 5, 2003 (UTC)

On point 2 (signing the letter). It appears that Einstein did dictate a letter, but it wasn't sent, and he instead signed two drafts written by Szilard (which IIRC were prepared before the first visit). There is some evidence here: http://www.google.com/search?q=signed+szilard+einstein+visit+teller ; if you don't have any to the contrary, the text should be changed back. -- Pde 00:34 Apr 8, 2003 (UTC)

Einstein saying, "I really only acted as a mail box. They brought me a finished letter and I simply signed it" seems pretty convincing to me. I'll change it back. -- Someone else 00:49 Apr 8, 2003 (UTC)

Please do not deprive the artice from a perfectly correct and relevant information based on a "Google search". Einstein was not a moron to mindlessly sign something that others had drafted for him. Others may have helped him with the English text of the letter as Einstein's first language was German, but the contents of the letter clearly show it was his own. Furthermore, he was the ONLY signator of that letter, not one of many. This is not a negative reflection on Einstein as the article mentions that later in life he regretted having written that letter. I will put the original text back into the article.    --Keyvan 15:59 Apr 9, 2003 (UTC)

It seems that Einstein became a Swiss citizen in February 1901. Why would that be incompatible with being director of Kaiser Wilhelm Institute for Physics in Berlin from 1914 to 1933? -- Someone else 03:33 Apr 5, 2003 (UTC)

Because unfortunately, if a lie is repeated enough for the masses, they start to believe it to be a fact. The fact is that Einstein was a citizen of Germany, and the Nazi regime revoked his citizenship in March of 1934. But by that time, Einstein was already living in USA (I believe he moved to USA in 1933). --Keyvan 03:39 Apr 5, 2003 (UTC)

I haven't looked it up in a reputable source, as I have none at hand. I trust you have done so. It's not hard to envision that he switched citizenships more than once, or that the Germans considered him a German citizen when he himself did not. -- Someone else 03:44 Apr 5, 2003 (UTC)

Now looked up. According to Larousse's Biographical Dictionary, he took Swiss nationality in 1901 and was appointed examiner at the Swiss Patent Office 1902-1905, and became an American citizen in 1940. -- Someone else 03:51 Apr 5, 2003 (UTC)

Perhaps it was possible to have dual citizenship, or as you said, maybe he switched back and forth multiple times. But he certainly did serve as director of Physics Institute at the Kaiser Wilhelm Society for the Advancement of Sciences from 1914 to 1933. And his citizenship was revoked in 1934, so that suggests that by 1934 he was still a citizen of Germany (at least on paper). If he had no alligiance to Germany all that time, indeed it would seem odd (perhaps even unethical) to accept such a high ranking position for nearly 20 years, and enjoy all the benefits. He certainly developed the bulk of his scientific achievements there. --Keyvan 03:58 Apr 5, 2003 (UTC)

I see no reason a Swiss citizen could not reside and work in Germany. If you find a reference that says he was a German citizen at the time, or a dual citizen, by all means add it. -- Someone else 04:03 Apr 5, 2003 (UTC)