実じつ在ざい気き体たいじつざいきたいMeanings1nounreal gasTechnical term in physics and chemistry, contrasted with 理想気体 (ideal gas). Used when gas behavior deviates from the ideal gas law.See also: 理想気体実じつ在ざい気き体たいは、高こう圧あつ下かでは理り想