10/6/2023 0 Comments Dead space lungs![]() ![]() The lungs never collapse completely during respiration. The relevant data would be the comparison between this dead volume and the lung capacity and/or the volume of one respiration cycle. ![]() The authors refer to the dead volume behind the mask as the main problem. This also explains why the authors measure average concentrations of around 2700ppm-CO2, way above the ambient value of 740ppm, even when no mask is present. Thus, it is impossible to separate the concentration of CO2 in inhaled and exhaled air using this device. A normal respiration cycle has a duration of 3 to 4 seconds. This device is unsuitable for measuring the transient concentrations during the respiration processes. 2000ppm) and a time response T^90<=20 seconds for CO2. The authors use an CO2 incubator analyzer (0-20%) that has an accuracy of 1% of the range (i.e.
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