a separation technique in which separation mainly according to the hydrodynamic volume of the molecules or particles takes place in a porous non-adsorbing material with pores of approximately the same size as the effective dimensions in solution of the molecules to be separated, analüütiline metoodika, mille puhul molekulide või muude osakeste eraldamine toimub peamiselt nende hüdrodünaamilise ruumala alusel, kasutades mitte-absorbeerivat materjali, mille pooride mõõdud vastavad ligikaudselt eraldatavate osakeste efektiivsetele