1. 
   Physisorption
   Physisorption, also called physical adsorption, is a process in which the electronic structure of the atom or molecule is barely perturbed upon adsorption. ==Introduction== The fundamental interacting force of physisorption is caused by van der Waals force. Even though the interaction energy is ver...
   Found op http://en.wikipedia.org/wiki/Physisorption
   
   
2. 
   physisorption
   The binding of an adsorbate to the surface of a solid by forces whose energy levels approximate those of condensation. Contrast with chemisorption.
   Found op http://www.encyclo.co.uk/local/20742
   
   

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