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蒸氣是指處於液態固態的物質的周圍所包含的相同物質的氣態組分。與純的氣態物質不同的是,蒸氣必然伴隨着相同物質的另一狀態(固態或液態);如果固態或液態的物質完全轉化為蒸氣,則此時的蒸氣就不再稱為蒸氣而是定義為純的氣態物質。蒸氣來源與沸點以下的液態物質的蒸發或者固態物質的昇華。由於有蒸氣的存在,很多物質都存在蒸氣壓

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