Why is N₂O the ideal gas for measuring the extent to which pulmonary blood contributes to the diffusion rate?

Question

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If N₂O is inhaled, the pulmonary capillary blood reaches its maximum capacity for N₂O almost instantly (Figure 7-7). N₂O partial pressures across the alveolar capillary membrane reach equilibrium in the first one-twentieth of the distance along the capillary. Increased blood flow causes N₂O-saturated blood to exit the capillary sooner, allowing more mixed venous blood to enter and take up alveolar N₂O. Thus, diffusion of N₂O in the lung is perfusion limited. This makes N₂O an ideal test gas to measure pulmonary blood flow.

Why Is N2O the Ideal Gas for Measuring the Extent

Why Is N₂O the Ideal Gas for Measuring the Extent