Single ice crystals were formed on a rabbit hair in helium gas of 1 and 10 atm at -14°C and a supersaturation of 12%. Long needles grow with high frequency in the gas of 10 atm, which never grow in the gas of latm.
Next, ice crystals were formed in helium gas of 10 atm at -14°C and at high and low supersaturations, and their growth forms were studied. The size ratio c/a of ice crystals formed at a low supersaturation hardly depends on crystal size, while that at a high supersaturation depends markedly on crystal size and its dependence is mainly determined by the size ratio c/a of minute ice crystals of about 30 μm.
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