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.
Has anyone thought about including the one-point-measuring method on the page? It saves conducting several experiments to determine Va for a single sample. Instead, the following approximation is used: Vm = Va * (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)
Reported Activated Carbon Surface Area
The value of specific surface area listed in the section about activated carbon (3000 m^2/g) seems much larger than the typical values I am familiar with of 750 - 1500 m^2/g. Is this value correct and typical, or ought it to be revised? --220.127.116.11 (talk) 14:11, 27 April 2010 (UTC)
The current definition of "P and P0 are the equilibrium and the saturation pressure of adsorbates at the temperature of adsorption,..." seems to be inverse of what it should be, i.e. P - saturation pressure, P0 - eq. pressure. Also, P could be renamed Ps, and both terms should be defined. Adacus12 (talk) 23:22, 12 June 2010 (UTC)