Talk:BET theory

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I am fairly sure the equation on this page is incorrect.

I use a BET surface area measuring instrument and sought to explain it to myself using this equation, but was unable to. Reordering the equation from the Peter Atkins, Julio de Paula Physical Chemistry text (seventh edition, p.992) yielded a different equation, one that matched the information I am receiving from the instrument. The difference is in the first half of the right side of the equation.

It should read:

1/(((Po/P)-1)V) =((c-1)/(cVm))*(P/Po) + 1/(cVm)

I am not fluent in Wikipedia etiquette or code, and will wait a few days before changing anything. Please advise.

T. Nelson

[edit] one-point method

Has anyone thought about including the one-point-measuring method on the page? It saves conducting several experiments to determine V_a for a single sample. Instead, the following approximation is used: V_m = V_a * (1-(p/p₀))

This approximation may be used if the constant C is much larger than 1.

Source: European Pharmacopoeia 4th edition, 2002, vol. 1 p.277ff (Monograph # 4.00/2.09.26.00)

Doublespeed 14:32, 2 July 2007 (UTC) i am sure that this equation is wrong. —Preceding unsigned comment added by 59.93.179.201 (talk) 05:42, 7 September 2007 (UTC)