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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.

Q: What is the effect of reducing the radius of the air flow tube on respiratory volumes?

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By reducing its radius or diameter.

You cannot because the volumes of the cones also depend on their heights.

Volumes: 523.5987756/65.44984695 = 8 times greater 53/2.53 = 8

the radius is from the center of the circle to the edge so that's how you find the radius.

Reducing the radius of the airways will affect the capacity of the lungs to exhale the maximum amount of air

Volume of the sphere varies as the cube of the radius.Tripling the radius increases the volume by a factor of (3)3 = 27.It takes 27 spherical volumes with radius 'r' to fill one spherical volume with radius '3r'.

They both have the same effect on the surface area of the pipe, but the radius has more effect on its volume/capacity.

Based on what? If you know the radius, you can use the formula for a sphere - which is a good approximation in the case of Earth and Moon.

If the ratio of the radii is 1:3 then the ratio of volumes is 1:27.