… One type grows by the condensation of water vapor, and is the main cause of warm rain. A core is necessary for water vapor to condense, and the most effective condensation nuclei that form the core of raindrops are giant sea salt nuclei with a radius of 1 μm or more (there are several per cm3 in the atmosphere, especially in coastal areas). These nuclei absorb water vapor easily, so for example, a nucleus with a radius of 1 μm in a dry state with a humidity of 78% (the main component of sea salt nuclei is NaCl) has already grown to a radius of about 2 μm. … *Some of the terminology that refers to "sea salt core" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 一つは水蒸気の凝結によって成長するもので,暖かい雨のおもな原因である。水蒸気が凝結するためには心核が必要であるが,とくに有効に雨滴の心核となる凝結核は半径1μm以上(大気中,とくに海岸地帯でほぼ数個/cm3存在する)の巨大海塩核である。この核は水蒸気を容易に吸収するため,たとえば湿度78%で乾燥状態の半径1μmの核(海塩核のおもな成分はNaCl)はすでに半径約2μmにも成長している。… ※「海塩核」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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