In the Physics (215a25), Aristotle effectively states a quantitative law, that the speed, v, of a falling body is proportional (say, with constant c) to its weight, W, and inversely proportional to the density, ρ, of the fluid in which it is falling:;
ɪnðə fˈɪzɪks tˈuːhˈʌndɹɪd fˈɪftiːn ˈeɪ twˈɛnti fˈaɪv, ˈæɹɪstˌɑːɾəl ɪfˈɛktɪvli stˈeɪts ɐ kwˈɔntᵻtˌeɪɾɪv lˈɔː, ðætðə spˈiːd, vˈiː, əvə fˈɔːlɪŋ bˈɑːdi ɪz pɹəpˈoːɹʃənəl sˈeɪ, wɪð kˈɑːnstənt sˈiː tʊ ɪts wˈeɪt, dˈʌbəljˌuː, ænd ɪnvˈɜːsli pɹəpˈoːɹʃənəl tə ðə dˈɛnsᵻɾi, ɹˈoʊ, ʌvðə flˈuːɪd ɪnwˌɪtʃ ɪɾ ɪz fˈɔːlɪŋ:;