In physics, a characteristic length is an important dimension that defines the scale of a physical system. Often such a length is used as an input to a formula in order to predict some characteristics of the system. Examples: In computational mechanics, a characteristic length is defined to force localization{dn|date=January 2014} of a stress soft...
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http://en.wikipedia.org/wiki/Characteristic_length
The ratio of the volume of the combustion chamber of a rocket engine to the area of the nozzle`s throat. Characteristic length gives a measure of the average distance that the products of burned fuel must travel to escape.
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http://www.daviddarling.info/encyclopedia/C/characteristic_length.html
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