肺胞気式
R = P E CO 2 ( 1 − F I O 2 ) P i O 2 − P E O 2 − ( P E CO 2 ∗ F i O 2 ) {\displaystyle R={\frac {P_{E}{\ce {CO2}}(1-F_{I}{\ce {O2}})}{P_{i}{\ce {O2}}-P_{E}{\ce {O2}}-(P_{E}{\ce {CO2}}*F_{i}{\ce {O2}})}}}