Physical adsorption
or less precisely fizysorpcja, a phe nomenon or process of adsorption due to the impact forces między cząsteczkowego - van der Waals forces (with the exception of che mical bonds - then we are talking about a chemical adsorption, or chemisorption) - adsorbatu between molecule and adsorbent surface. Energy associated with the process of physical adsorption (heat of adsorption) is usually the order of several kJ / mol (rarely a few kJ / mol), where poczas for chemical adsorption is the size of government more (heat chemical reaction). The size of physical adsorption strongly depends on the temperature and pressure or concentration adsorbatu a pressure decrease or increase in temperature leads to a quick and easy desorption. Besides adsorbat-adsorbent interactions in such a system are always increasing the size of the adsorption interaction adsorbat-adsorbat.