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51g. 空氣中水蒸氣的含量(水蒸氣密度)是有極限的.在氣動壓力(2MPa)範圍內,可認為飽和空氣中水蒸氣的密度只取決於溫度的高低而和空氣壓力大小無關,溫度越高,飽和水蒸氣的密度越大,譬如,在40℃時,1m3空氣,不論其壓力是0.1MPa還是1.0MPa,它的飽和水蒸氣密度都是51g.
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