The kinetic behavior of the adsorption of weak polyacid, namely, poly(acrylic acid) on a smooth glass surface has been studied at 30-degrees-C. For the evaluation of various adsorption parameters-the adsorption coefficient, surface coverage (theta), and thickness of the adsorbed layer-a new simple kinetic model has been proposed. The effect of the factors such as pH, electrolyte concentration, and molecular weight on adsorption behavior has been studied.