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一氧化二氮(Nitrous Oxide N_2O)为无色气体,微臭稍有甜味。15℃及40气压时凝为无色液体,-167℃时凝为白色固体。液体比重0.9,熔点-90.8℃,沸点-88.5℃,临界温度37℃,临界压力+7.5气压。此气易溶于冷水,难溶于热水,除低温时可与水生成六水合物外,它并不与水作用。N_2O不助呼吸,遇热分解为N_2与O_2,故可助燃。熔化热1563千卡,
Nitrous oxide (Nitrous Oxide N_2O) is a colorless gas, slightly smelly slightly sweet. 15 ℃ and 40 when the condensate condensate into a colorless liquid, when -167 ℃ condensate to a white solid. The liquid has a specific gravity of 0.9, a melting point of -90.8 ° C, a boiling point of -88.5 ° C, a critical temperature of 37 ° C and a critical pressure of +7.5 bar. This gas is easy to dissolve in cold water, insoluble in hot water, except when low temperature can generate water with hexahydrate, it does not interact with water. N_2O does not help breathing, the case of thermal decomposition of N_2 and O_2, it can help combustion. Melting heat 1563 kcal,