Micromeritics Gemini VII 2390a, Operator'S Manual, Page: 309 / 426

Dp
J
2
Rc
J
 
=
Vp
I

Lp
I
 
D
avg
I
2
-------------
2
10
16
cm
2
/
A
2
=
VP
CUM
1  
Vp
J
for J
1
  

=
SA
I

LP
I
 
10
2 –
m
/
cm
 
D
avg
I
 
10
10 –
m
/
A
 
=
SA
CUM
10
SA
J
for J
1


=
dV
/
dD
I
VP
I
Dp
I
Dp
I
1 +
–
--------------------------------
=
Gemini VII Appendix C
239-42828-01 - Dec 2012 C-15
(not including D
avgK
)
The layer thickness change desorbed during this interval also is added to the radii corre-
sponding to the ends of the pressure intervals as follows:
for all except Rc
K+1
.
Steps a to c are repeated for each pressure interval.
After the above calculations have been performed, the diameters corresponding to the ends of
the intervals are calculated as follows:
for all Rc
J
including Rc
K+1
.
The remaining calculations are based on DP
(I)
, D
avg(I)
, and LP
(I)
. These calculations are only
done for D
avg(I)
values that fall between the Minimum BJH diameter and the Maximum BJH
diameter specified by the operator on the BJH Adsorption Report Options dialog or the BJH
Desorption Report Options dialog.
(1.) Incremental Pore Volume (Vp
I
, cm
3
/g):
(2.) Cumulative Pore Volume (Vp
CUM(1)
, cm
3
/g):
(3.) Incremental Surface Area (SA
I
, m
2
/g):
(4.) Cumulative Surface Area (SA
CUM(I)
, m
2
/g):
(5.) dV/dD pore volume (dV/dD
I
, cm
3
/g-A):
Rc
Jnew
Rc
Jold

Tw
+ =