User:Milton Beychok/Sandbox: Difference between revisions

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Many of the regularities (or symmetries) observed in [[science]] may be expressed as the '''laws of conservation''', each of which states that a particular measurable property (or quantity) of an isolated physical system does not change (i.e., is constant) during the course of time. These laws are perhaps the most powerful tools of analysis in [[physics]].<ref>{{cite book|author=Gerald J. Holton and Stephen G. Brush|title=Physics, the Human Adventure: From Copernicus to Einstein and Beyond|edition=3rd Edition|publisher=Rutgers University Press|year=2001|id=ISBN 0-8135-2908-5}}</ref><ref>{{cite book|author=William M. Gibson and Brian R. Pollard|title=Symmetry Principles in Elementary Particle Physics|edition=1st Edition|publisher=Cambridge University Press|year=1976|id=ISBN 0-521-20787-8}}</ref>


Another important function of the laws of conservation is that they make possible the prediction of the [[macroscopic]] behavior of a system without necessarily delving into the [[microscopic]] details of the system and its behavior.
There are a good many laws of conservation. For example, there are the conservation of [[mass]], conservation of [[Energy (science)|energy]], conservation of [[momentum ]]and conservation of [[Charge (physics)|charge]].<ref>At one time, it was thought that the law of conservation of [[mass]] and the law of conservation of [[Energy (science)|energy]] were separate and distinct. However, in the early 20th century, the [[German]]-born physicist [[Albert Einstein]] showed that mass can change into energy and  that energy can change into mass. This made necessary a restatement of the laws of conservation of mass and energy, namely that the total amount of mass plus energy before and after a change remains constant.</ref>
==References==
{{reflist}}

Revision as of 20:48, 16 March 2010

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