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13:45 Jun 24, 2004
English to English translations [PRO] Tech/Engineering - Chemistry; Chem Sci/Eng
Explanation: Diffuison occurs in a welth of phsical phenomena.
For example, when light enters the atmosphere, it is diffused, and therefore its intensity in the forward direction decreases. You can define a characteristic length, eg as the distance after which the intensity is 1/2 of the initial value. (Or another one by 1/e = 0.37... of the initial value.)
The same goes for molecules. Brownian motion is a prime example.
This characteristic length is called diffusion path length.
Diffusion is of statistical nature, so after traversing a thickness of the atmospeher equal to this characteristic length, the light intensity is about 50% of the initial value - howeever, the deviations are pretty small.
Attila Piróth France Local time: 03:33 Specializes in field Native speaker of: Hungarian PRO pts in category: 11