Micromeritics Gemini VII 2390a, Operator'S Manual, Page: 334 / 426

Appendix C Gemini VII
C-40 239-42828-01 - Dec 2012
Control Chart Variables
Mean

y
i
N
---------
=
StdDev

y Mean
–
 
2
N
1 –
------------------------------------ =
CoefVar
StdDev
Mean
-------------------
=
PlusNSig Mean n StdDev

+ =
MinusNSig Mean n StdDev

– =
Summary Report
The following calculations and the results of previous calculations (as noted) are used to generate the
summary report:
a.) Single-point Surface Area (m
2
/g)
S
1
PT
Va
1
Pr
–
    
CSA
6.023 10
23
    
22414
cm
3
STP
10
18
nm
2
/
m
2

-------------------------------------------------------------------------------------------------
=
where
Pr = pressure closest to 0.3 of the relative pressure points designated for surface
area calculations.
Va = volume corresponding to Pr
b.) Multipoint Surface Area
See BET Surface Area Calculations
c.) Langmuir Surface Area
See Langmuir Surface Area Calculations
d.) t-Plot Micropore Surface Area
See t-Plot calculations
e.) t-Plot External Surface Area
See t-Plot calculations
f.) BJH Cumulative Adsorption