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气体的分压在混合气体中的某一气体分压与其单独占据空间时的压力一样,即是气体分压与其部分浓度成比例。由于声门以下的呼吸道中的气体具有体温的温度且已充分湿化,而部分浓度却以干燥气体表示,故必需考虑水蒸气所产生的压力。在气管内吸气末的氧分压(P_(IO2))如下式: P_(IO2)=F_(IO2)(P_B-47)托尔(torr) (式1)
Partial pressure of a gas The partial pressure of a gas in a mixed gas is the same as the pressure when it occupies space alone, that is, the partial pressure of gas is proportional to its partial concentration. Since the gas in the respiratory tract below the glottis has a temperature of body temperature and has been sufficiently wetted, while part of the concentration is expressed in dry gas, it is necessary to consider the pressure generated by the water vapor. The partial pressure of oxygen at the end of inhalation in the trachea (P_ (IO2)) is as follows: P_ (IO2) = F_ (IO2) (P_B-47) Torr (Equation 1)