1.Onemillimeterisequalto0.000001kilometers.Thisconversionisarrivedatbydividingonemeterby1000(since1meterequals0.001kilometers)andthenfurtherdividingby1000,as1millimeterisequivalentto0.001meters.2.Onemillimeterisalsoexpressedas1x10^-6kilometersinscientificnotation.Thismethodusesapowerof10toindicatehowmanyplacesthedecimalpointshouldbemovedtotheleft,with-6indicatingamovementofsixplaces.3.Unitconversioniscrucialinmathematicsandscience,asitenablesustoswitchbetweendifferentunitsofmeasurementforprecisecalculationsandcomparisons.