mean residence time

of adsorbed molecules
The mean time during which the molecules remain on the surface of the adsorbent, i.e. the mean time interval between impact and desorption.
Source:
PAC, 1976, 46, 71 (Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis) on page 79