Micromeritics ASAP 2460, Operator'S Manual

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ASAP 2460 Operator’s Manual Appendix C
246-42800-01 - Aug 2013 C-31
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):
where
V
mol
= liquid molar volume from the fluid property information
dV/dD Pore Volume (cm
3
/g-Å):
Median Pore Width (Å):
where
D
l
= pore width ( L
i
) that corresponds to V
l
D
g
= pore width ( L
i
) that corresponds to V
g
V
cum,n
= total cumulative pore volume ( V
cum,i
) for points designated for Horvath-
Kawazoe calculations
V
g
= cumulative pore volume ( V
cum,i
) for first point greater than V
half
V
half
= 50% of total cumulative pore volume
V
l
= cumulative pore volume ( V
cum,i
) for first point less than V
half
AL
i
L
i
Ds – =
V
cum i

Q
i
V
mol
22414cm
3
STP
-------------------------------------
=
dV
dD
i
---------
V
cum i

V
cum i 1 –

–
AL
i
AL
i 1 –
–
-----------------------------------------
=
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
--------------------------------------------

+ =