Micromeritics ASAP 2460, Operator'S Manual

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Appendix C ASAP 2460 Operator’s Manual
C-24 246-42800-01 - Aug 2013
Compendium of Variables

Td = thickness of layer desorbed from walls of newly opened pores (Å)

Tw = thickness of adsorbed layer desorbed during interval (Å)
A = adsorbate property factor; from the
BJH Adsorptive Options
window
CSA = analysis gas molecular cross-sectional area (nm
2
), user-entered on the
Adsorptive Properties
window
CSAa = annular cross-sectional area of the desorbed layer (cm
2
)
CSAc = cross-sectional area of opening of newly opened pores (cm
2
)
D
avg
= average pore diameter (Å)
Dp = pore (or core) diameter (Å)
F = fraction of pores open at both ends; from the
BJH Adsorption Report
Options
window or the
BJH Desorption Report Options
window
LP = length of pore (cm/g)
P = relative pressure
Q = quantity adsorbed expressed as a volume (cm
3
/g STP)
Rc = Kelvin radius (Å) of core
SAw = total surface area of walls exposed (cm
2
/g)
Tw = thickness of remaining adsorbed wall (Å)
Vc = volume desorbed from cores of newly opened pores (cm
3
/g)
Vd = volume of gas desorbed from walls of previously opened pores (cm
3
/g)
Vl = liquid equivalent volume of volume adsorbed (cm
3
/g)
V
mol
= liquid molar volume, from the fluid property information