<Dl> <Dd> <Dl> <Dd> <Dl> <Dd> F A C O O (\ displaystyle F_ (A_ (CO_ (O)))) is the initial alveolar fractional CO concentration, as calculated by the dilution of the tracer gas . </Dd> <Dd> V B (\ displaystyle V_ (B)) is the barometric pressure </Dd> </Dl> </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> <Dl> <Dd> F A C O O (\ displaystyle F_ (A_ (CO_ (O)))) is the initial alveolar fractional CO concentration, as calculated by the dilution of the tracer gas . </Dd> <Dd> V B (\ displaystyle V_ (B)) is the barometric pressure </Dd> </Dl> </Dd> </Dl> </Dd> <Dl> <Dd> <Dl> <Dd> F A C O O (\ displaystyle F_ (A_ (CO_ (O)))) is the initial alveolar fractional CO concentration, as calculated by the dilution of the tracer gas . </Dd> <Dd> V B (\ displaystyle V_ (B)) is the barometric pressure </Dd> </Dl> </Dd> </Dl> <Dd> <Dl> <Dd> F A C O O (\ displaystyle F_ (A_ (CO_ (O)))) is the initial alveolar fractional CO concentration, as calculated by the dilution of the tracer gas . </Dd> <Dd> V B (\ displaystyle V_ (B)) is the barometric pressure </Dd> </Dl> </Dd>

What is not directly proportional to diffusion of a volume of gas to the lungs