Talk:Polydispersity index

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You have new messages (last change).

I think the the author has got the number avg and the weight avg backwards. it's numb avg / weight avg. not other way around.

It's weight average / number average. PDI is always larger than 1.
\bar{M}_w=\frac{\sum_i N_iM_i^2}{\sum_i N_iM_i} and \bar{M}_n=\frac{\sum_i N_iM_i}{\sum_i N_i}.
Nathaniel 06:19, 15 December 2005 (UTC)
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