Appendix C TriStar II 3020
C-18 302-42828-01 - Dec 2012
Compendium of Variables
Va = volume adsorbed expressed as a volume (cm
3
/g STP)
Vl = liquid equivalent volume of volume adsorbed (cm
3
/g)
D = density conversion factor from the Adsorptive Properties dialog cm
3
/cm
3
STP)
Pr = relative pressure
Dp = pore (or core) diameter (A)
Rc = Kelvin radius (A) of core
A = adsorbate property factor; from the BJH Adsorptive Options dialog
F = fraction of pores open at both ends; from the BJH Adsorption Report Options
dialog or the BJH Desorption Report Options dialog
Tw = thickness of adsorbed layer desorbed during interval (A)
Tw = thickness of remaining adsorbed wall (A)
HP1, HP2, and HP3 are Halsey Parameters from the Halsey Thickness Equation dialog.
HJ1, HJ2, and HJ3 are Harkins and Jura Parameters from the Harkins/Jura Thickness Equation dialog.
STSA1, STSA2, and STSA3 are STSA parameters from the STSA Thickness Equation dialog.
Vd = volume of gas desorbed from walls of previously opened pores (cm
3
/g)
Davg = average pore diameter (A)
CSAa = annular cross-sectional area of the desorbed layer (cm
2
)
CSAc = cross-sectional area of opening of newly opened pores (cm
2
)
SAw = total surface area of walls exposed (cm
2
/g)
Td = thickness of layer desorbed from walls of newly opened pores (A)
Vc = volume desorbed from cores of newly opened pores (cm
3
/g)
Lp = length of pore (cm/g)
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