Difference between revisions of "Conservation law"
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| − | '''Conservation law''' is a [[physical law]] that says that some physical quantity is conserved, which means ''never changes''. Examples of ''conserved quantities'' in physics are energy and momentum along 3 axes. So we have at least 4 independent conservation laws of momentum along axis 1, momentum along axis 2, momentum along axis 3, and energy, that is considered axis 4 by some | + | '''Conservation law''' is a [[physical law]] that says that some physical quantity is conserved, which means ''never changes''. Examples of ''conserved quantities'' in physics are energy and momentum along 3 axes. So we have at least 4 independent conservation laws of momentum along axis 1, momentum along axis 2, momentum along axis 3, and energy, that is considered axis 4 by some authors or axis 0 by others. Usually mathematicians use different convention for numbering axes than physicists, who number axes starting from 0 for ''energy'', and so on for other axes (e.g. t, x, y, z where t denotes ''time'', and the rest relate to ''space''). |
[[Category:Physics]] | [[Category:Physics]] | ||
Revision as of 13:25, July 15, 2016
Conservation law is a physical law that says that some physical quantity is conserved, which means never changes. Examples of conserved quantities in physics are energy and momentum along 3 axes. So we have at least 4 independent conservation laws of momentum along axis 1, momentum along axis 2, momentum along axis 3, and energy, that is considered axis 4 by some authors or axis 0 by others. Usually mathematicians use different convention for numbering axes than physicists, who number axes starting from 0 for energy, and so on for other axes (e.g. t, x, y, z where t denotes time, and the rest relate to space).