““The hotter a substance, the faster and the less ordered its molecular motion, and the larger the momentum with which molecules collide. Above 0 degrees Celsius, the water molecules collide so frequently and so violently that no structure can appear or be sustained. Should there be somewhere in the water a small piece of ice, it's molecules will be rent asunder by the momentum of the surrounding molecules. It is only at 0 degrees that the number of these hits and their impact no longer suffice to destroy incipient structures: The water can now freeze into ice.””
