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蒸气是指处于液态固态的物质的周围所包含的相同物质的气态组分。与纯的气态物质不同的是,蒸气必然伴随着相同物质的另一状态(固态或液态);如果固态或液态的物质完全转化为蒸气,则此时的蒸气就不再称为蒸气而是定义为纯的气态物质。蒸气来源与沸点以下的液态物质的蒸发或者固态物质的升华。由于有蒸气的存在,很多物质都存在蒸气压

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