FIGURE 13. Variation of ice crystal habit With temperature and supersaturation of ice crystals grox_ving on a
bre in the diffusion chamber. The plates (top left) have grown on the ends of pr15ms after the prrsms were
raised to the higher temperature.
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FIGURE ll. Supercooled drops nucleated at — 6 °C and — 20 °C. At the lower temperature air bubbles
have nucleated ahead of the growing dendrites and have subsequently become trapped [Photographs D.
Johnson].