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# AlvCapExch

Models two compartments, fluid and air, for a soluble gas passively exchanging between the volumes, V1 liquid, V2 air, forming a closed system. Assumes constant volumes, dry air. Simple model of alveolar-capillary gas exchange.

Model number: 0429

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## Description

``` Simple two compartment model of gas exchange between fluid and gas compartments. Emphasis
is on mass exchange as the mass flux of gas across a phase boundary can be confusing.
For this model the compartment volumes and temperature are held constant and the system is
closed so that the total mass in the system is constant.

Amount of CO2 in water compartment = QCO2cap (mol) = CCO2 (mmoles/ml) * VolWater (ml)
Amount of CO2 in air compartment   = QCO2air (mol) = pCO2 (mmHg) * VolAir (ml)
*(pCO2/760)/(((37+273)/273)*22400 ml/mol)
Example for water with pCO2 of 50 mmHg: Amount Q for CO2 in H2O at 37C (or 310K) =
= AlphaCO2w37 (ml/ml)* (50/760) / (((37+273)/273)*22400)

STP O2 and CO2 Solubility Equations from Christmas 2017 Eq 4a and 4b:
Christmas KM and Bassingthwaighte JB. Equations for O2 and CO2 solubilities
in saline and plasma: Combining temperature and density dependences.
J Appl Physiol 122: 1313-1320, 2017.

``` 