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What is the effect of reducing the radius of the air flow tube on respiratory volumes?
Wiki User
∙ 12y ago
Volumes can be the same if you lengthen the time of inhalation or exhalation but your flows will be reduced significantly. The effect of radius on air flow is a relationship that is to the power of 4. As an example, if you decrease the radius by half, the flow rate is reduced to 1/16th of the original (1/2 squared and then squared again).
This is why a slight reduction in radius can be quite severe. For asthmatics and those with COPD, the problem often isn't getting air in as much as getting air out.
Wiki User
∙ 12y ago
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