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- Path: sparky!uunet!cs.utexas.edu!sun-barr!ames!agate!dog.ee.lbl.gov!csa3.lbl.gov!sichase
- From: sichase@csa3.lbl.gov (SCOTT I CHASE)
- Newsgroups: sci.physics
- Subject: Re: Axiom of Physics
- Date: 26 Aug 92 19:55:10 GMT
- Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
- Lines: 37
- Distribution: na
- Message-ID: <25781@dog.ee.lbl.gov>
- References: <1992Aug26.174922.6115@pellns.alleg.edu>
- Reply-To: sichase@csa3.lbl.gov
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-
- In article <1992Aug26.174922.6115@pellns.alleg.edu>, frisinv@alleg.edu writes...
- >A friend and I have a small disagreement about the existance of an axiom
- >of physics. She claims that all assumptions in physics are made from
- >empirical evidence and therefore there are no axioms in physics. I
- >maintain that the conservation of mass/energy is an axiom. Here is my
- >argument: an axiom must be based on evidence. Euclid didn't just say
- >parallel lines don't intersect, he saw evidence that they didn't and then
- >stated the postulate. We have seen that energy and mass seem to be
- >conserved. There is very strong evidence that they are conserved but (to
- >my limited knowlege) there is no proof that they are conserved in all
- >cases. Thererfore, conservation of mass/energy is an axiom of physics. Can
- >anyone think of other axioms of physics?
-
- Sometimes axioms are used in physics. Special relativity might be a good
- example. There was evidence that things did not work as expected according
- to Newton. Einstein came along with a new axiom - the speed of light is
- the same in all inertial frames of reference - and found that the theory
- which can be derived from this axiom explained some otherwise bizzare
- experiments, and made some verifiable predictions as well (which turned
- out to be correct, of course.)
-
- Whether we would still say, almost 90 years later, that "the speed of light
- is the same in all inertial frames" is still an axiom or an experimental
- fact is a different matter.
-
- Eventually, one hopes that all axioms undergo direct experimental test,
- verifying the fundmental assumptions of the theory by direct confrontation
- with reality. At that point, I suppose they loose their status as axioms
- and become experimental facts.
-
- -Scott
- --------------------
- Scott I. Chase "The question seems to be of such a character
- SICHASE@CSA2.LBL.GOV that if I should come to life after my death
- and some mathematician were to tell me that it
- had been definitely settled, I think I would
- immediately drop dead again." - Vandiver
-