Why do physisorption and chemisorption behave differently with a rise in temperature?

(N/A) In physisorption,the adsorption is held by weak van der Waals' forces. As temperature increases,the kinetic energy of the gas molecules increases,which leads to desorption,thus physisorption decreases with a rise in temperature.
In chemisorption,chemical bonds are formed between the molecules of the adsorbate and the adsorbent. This process often requires an activation energy to initiate the bond formation. Therefore,chemisorption typically increases with an initial rise in temperature.