The density of the alkanes usually increases with the number of carbon atoms but remains less than that of water.
ðə dˈɛnsᵻɾi ʌvðɪ ˈælkeɪnz jˈuːʒuːəli ˈɪŋkɹiːsᵻz wɪððə nˈʌmbɚɹ ʌv kˈɑːɹbən ˈæɾəmz bˌʌt ɹᵻmˈeɪnz lˈɛs ðɐn ðæt ʌv wˈɔːɾɚ.