1) Action 2) Activity 3) Natural action 4) Natural process 
Desorption is a phenomenon whereby a substance is released from or through a surface. The process is the opposite of sorption (that is, either adsorption or absorption). This occurs in a system being in the state of sorption equilibrium between bulk phase (fluid, i.e. gas or liquid solution) and an adsorbing surface (solid or boundary separating t...
Opposite of adsorption; a decrease in the amount of adsorbed substance.
Evaporation of a species (i.e. molecule) from a grain surface.
the process of removing an adsorbed material from the solid on which it is adsorbed
(de-sorp´shәn) the process of being desorbed.
opposite of absorption or adsorption. In filtration, it relates to the downstream release of particles previously retained by the filter.
the removal of adsorbed gas or liquid molecules from the surface of a solid
[n] - changing from an adsorbed state on a surface to a gaseous or liquid state
Release of adsorbed or absorbed material . 
noun changing from an adsorbed state on a surface to a gaseous or liquid state