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). These laws are perhaps the most powerful tools of analysis in [[physics]]. | 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]]. | ||
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> | 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> | ||
Revision as of 13:42, 16 March 2010
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.
There are a good many laws of conservation. For example, there are the conservation of mass, conservation of energy, conservation of momentum and conservation of charge.[1]
References
- ↑ At one time, it was thought that the law of conservation of mass and the law of conservation of 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.