Due to the different surface tensions of the two liquids, stable emulsions cannot be created simply by mixing.
dˈuː tə ðə dˈɪfɹənt sˈɜːfɪs tˈɛnʃənz ʌvðə tˈuː lˈɪkwɪdz, stˈeɪbəl ɪmˈʌlʃənz kænˈɑːt biː kɹiːˈeɪɾᵻd sˈɪmpli baɪ mˈɪksɪŋ.