Supersaturation - kahouwado

Japanese: 過飽和度 - かほうわど
Supersaturation - kahouwado

...The falling speed is about 0.8 m/s for a diameter of 1 cm and 0.4 m/s for a diameter of 3 to 4 cm.
[What determines the shape of a snowflake? Nakatani diagram]
In 1935, Ukichiro Nakaya of Hokkaido University succeeded in creating snow crystals artificially for the first time in a low-temperature laboratory, and subsequently discovered that the shape of a snow crystal is determined by the temperature of the atmosphere at the time it grows and the degree of water vapor supplied (degree of supersaturation). (The humidity inside the clouds in which snow crystals grow exceeds 100% (saturation state). This state is called supersaturation, and the degree of supersaturation is expressed.)

*Some of the terminology that refers to "supersaturation" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…落下速度は,直径1cmで0.8m/s,3~4cmで0.4m/s程度である。
[雪の結晶形を決めるもの――中谷ダイヤグラム]
 1935年北海道大学の中谷宇吉郎は低温実験室内で雪の結晶を人工的に作ることに初めて成功し,つづいて,雪の結晶形はそれが成長するときの大気の温度と水蒸気が補給される度合(過飽和度)で決まることを見いだした(雪の結晶が成長する雲内部の湿度は100%(飽和状態)を超える。この状態を過飽和状態といい,その度合を過飽和度で表す。…

※「過飽和度」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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