Step 1: Understand what adsorption means. Adsorption is when molecules stick to a surface.
Step 2: Learn about the two types of adsorption: physisorption (weak forces) and chemisorption (strong chemical bonds).
Step 3: Know that the Freundlich isotherm is a mathematical model that describes how much of a substance will stick to a surface at different concentrations.
Step 4: Realize that the Freundlich isotherm can be used for both types of adsorption: physisorption and chemisorption.