Explanation Of Terms - Micromeritics ASAP 2460 Operator's Manual

ASAP 2460 Operator's Manual

Explanation of Terms

A pore filled with condensed liquid nitrogen has three zones:
a.) The core - evaporates all at once when the critical pressure for that radius is reached; the
relationship between the core radius and the critical pressure is defined by the Kelvin
equation.
b.) The adsorbed layer - composed of adsorbed gas that is stripped off a bit at a time with each
pressure step; the relationship between the thickness of the layer and the relative pressure is
defined by the thickness equation.
c.) The walls of the cylindrical pore - the diameter of the empty pore is required to determine
the pore volume and pore area. End area is neglected.
246-42800-01 - Aug 2013
Insignificant
compared to
core length
Pore
Wall
Appendix C
C-15