Freezing Nuclei 3. Ice a liquid water together in a cloud - ice crystals grow at the expense of the surrounding water droplets . The saturation vapor pressure over a water surface is greater than that over an ice surface at the same subfreezing temperature. Cloud seeding - used to disperse supercooled fogs. Snow - Crystals have six sides, common forms are Plate, Column and Dendrite.
Shape depends on the temperature actual vapor pressure the crystals grow in.
Maximum difference in vapor pressure between ice and water. Snow flakes are aggregates of ice crystals. Freezing level much higher in summer than winter. Fall streaks Good insulator, dry snow sounds crunchy. If the water freezes slowly, the air escapes and the ice looks clear.