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With many systems, especially those containing micropores, low pressure hysteresis (indicated by the dashed lines in Figure 3), may be observed extending to the lowest
attainable pressures. Removal of the residual adsorbed material is then possible only if the adsorbent is outgassed at higher temperatures. This phenomenon is thought to be
associated with the swelling of a non¡ªrigid porous structure or with the irreversible uptake of molecules in pores (or through pore entrances) of about the same width as that of
the adsorbate molecule.
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