Adsorption and absorption are two different things. Absorption is the chemical integration of one chemical into another. When you drink a
glass of
water, you are absorbing it, as the
water becomes part of you. Adsorption occurs when one substance holds another via physical bonds. If you spill a
glass of
water on your shirt, it is adsorbed as the fibres will hold the
water until
heat dries out the shirt.