Densitiesofaqueoussolutionsof�3-ami- no-1-propanol,� 2-amino-1-propanol,� 3-amino-1,2-propanediol,�and�1,3-diami- no-2-propanolweremeasuredat�298.15� Kusingthevibratingtubetechnique.�The� apparentmolarvolumesofthealkanola- minesweredeterminedasafunctionof� compositionfromexperimentaldataand� thesolutelimitingpartialmolarvolu- mewasobtainedthroughextrapolation.� Theresultsarediscussedintermsofthe� effectofthenumberandthepositionof� polargroupsinthemolecules.