What is difference between physisorption and chemisorption ?

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$\begin{matrix} S . N O & P h y s i s o r p t i o n & C h e m i s o r p t i o n 1. & I t o c c u r s d u e t o v a n d e r w a a l s^{'} & I t i s f o r m e d b y t h e f o r c e s . & f o r m a t i o n o f c h e m i c a l b o n d s . 2. & I t i s n o t s p e c i f i c i n n a t u r e & I t i s h i g h l y s p e c i f i c i n n a t u r e 3. & I t i s r e v e r s i b l e i n n a t u r e & I t i s i r r e v e r s i b l e 4. & E n t h a l p y o f a d s o r p t i o n i s l o w & E n t h a l p y o f a d s o r p t i o n i s (a p p r . 20 - 40 k J m o l^{- 1}) & h i g h (a p p r .80 - 240 k J m o l^{- 1}) 5. & I t d e p e n d s o n t h e n a t u r e o f & I t a l s o d e p e n d s o n t h e n a t u r e g a s . M o r e e a s i l y l i q u e l i a b l e & o f g a s . G a s e s w h i c h c a n r e a c t g a s e s a r e a d s o r b e d r e a d i l y & w i t h t h e a d s o r b e n t, s h o w c h e m i s o r p t i o n . 6. & L o w t e m p e r a t u r e i s f a v o u r a b l e & H i g h t e m p e r a t u r e i s f a v o u r a b l e f o r p h y s i s o r p t i o n . & f o r c h e m i s o r p t i o n . 7. & N o a p p r e c i a b l e a c t i v a t i o n & H i g h a c t i v a t i o n e n e r g y i s e n e r g y i s r e q u i r e d & s o m e t i m e s r e q u i r e d 8. & I t r e s u l t s i n t o m u l t i m o l e c u l a r & I t r e s u l t s i n t o u n i m o l e c u l a r l a y e r l a y e r s o n t h e a d s o r b e n t s u r f a c e u n d e r h i g h p r e s s u r e . \end{matrix}$

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What is the difference between physisorption and chemisorption?

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