蒸氣(英文:vapor或vapour)係指啲液態或者固態嘅物質轉緊做氣態而又未到臨界點嗰陣出嚟嘅氣,同蒸汽(steam)唔同嘅係,「蒸汽」通常指已經過咗臨界點之後出嚟嘅氣,而「蒸氣」係指臨界點之前出嚟嘅氣,所以呢啲氣入面會夾雜住相同物質嘅另一狀態(固態或者液態)。
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