hɪz dɪtˌɜːmᵻnˈeɪʃən ʌv ɐtˈɑːmɪk wˈeɪts lˈɛd tuː "wˈʌn ʌvðə mˈoʊst pɹɪsˈaɪs kˈɛmɪkəl dɪtˌɜːmᵻnˈeɪʃənz ˈɛvɚ mˈeɪd", ðə ɹˈeɪʃɪˌoʊ ʌvðə mˈæsᵻz ʌv hˈaɪdɹədʒən tʊ ˈɑːksɪdʒən wˌɪtʃ hiː fˈaʊnd təbi wˈʌn.zˈiəɹoʊzˈiəɹoʊ sˈɛvənˈeɪtsˈɛvən:sˈɪkstiːn.
His determination of atomic weights led to "one of the most precise chemical determinations ever made", the ratio of the masses of hydrogen to oxygen (which he found to be 1.00787:16).