BET Adsorption Isotherm
One of the basic assumptions of Langmuir adsorption isotherm = adsorption is monolayer in nature
Applicable under low pressure
Gaseous molecule possess high thermal energy and high escape velocity
So less number of gaseous molecules would be available near the surface of adsorbent
BET theory put forward by Brunauer, Emmett and Teller explained that multilayer formation is the true picture of physisorption