sˈɪmɪlɚli, wˌɛn wˈɔːɾɚ vˈeɪpɚ kəndˈɛnsᵻz, hˈɛviɚ wˈɔːɾɚ mˈɑːlɪkjˌuːlz hˈoʊldɪŋ ˈeɪtiːn ˈoʊ ˈæɾəmz tˈɛnd tə kəndˈɛns ænd pɹɪsˈɪpᵻtˌeɪt fˈɜːst.
Similarly, when water vapor condenses, heavier water molecules holding 18O atoms tend to condense and precipitate first.