Micromeritics Gemini VII 2390a, Operator'S Manual, Page: 318 / 426

AL
I
L
I
DS
– =
Appendix C Gemini VII
C-24 239-42828-01 - Dec 2012
Additional Calculations
Based on the previous calculations, the following can be calculated:
Adjusted Pore Width (Å):

(Shell to Shell)
Cumulative Pore Volume (cm
3
/g):
V
CUM
I
V
I
D

=
dV
dD
I
---------
V
CUM
I
V
CUM
I
1 –
–
AL
I
AL
I
1 –
–
-------------------------------------------
=
where
D = density conversion factor (cm
3
liquid/cm
3
STP) on the Adsorptive Properties
dialog
dV/dD Pore Volume (cm
3
/g-Å):
Median Pore Width (Å):
V
HALF
V
CUM
N
2
-----------------
=
D
MED
10
D
L
 
log
V
HALF
 
V
L
 
log – log
 
D
G
 
D
L
 
log – log
V
G
 
V
L
 
log – log
----------------------------------------------- 
+ =
where
V
CUM
N
= total cumulative pore volume (V
CUM
I
) for points designated for Horvath-
Kawazoe calculations
V
HALF
= 50% of total cumulative pore volume
V
L
= cumulative pore volume (V
CUM
I
) for first point less than V
HALF
V
G
= cumulative pore volume (V
CUM
I
) for first point greater than V
HALF
D
L
= pore width (L
I
) that corresponds to V
L
D
G
= pore width (L
I
) that corresponds to V
G