difusion path lengths
English translation: diffusion path lengths
| 13:45 Jun 24, 2004 |
| English language (monolingual) [PRO] Tech/Engineering - Chemistry; Chem Sci/Eng | |||||
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| 5 +5 | characteristic length of diffusion |
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| 5 +4 | diffusion path lengths |
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Answers
23 mins confidence: 
peer agreement (net): +5
peer agreement (net): +5| diffusion path lengths characteristic length of diffusion 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. |
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