Uninzi lweempahla xa kusenziwa umlinganiselo wazo kusetyenziswa inombolo kunye [[i-unit of measurement nento yomlinganiselo. Into yomlinganiselo sisixa esimisiweyo. Inombolo ithelekisa impahla kwesa sixa simisiweyo. Oko kuthetha okokuba umthi obude bawo buzimitha eziphindwe kalishumi kuleyo yoluthi ebude buimitha ubude bawo buzimitha ezili-10.