| To measure the area of the lungs, Weibel developed a method, based on the idea of the Buffon needle problem. (Google is your friend.) Take a thin cross-section of a piece of the lungs. Superimpose a grid of lines on the cross-section and count the number, T, of these lines that cross the cross-section. Then the ratio of area, A, to volume, V, of the lungs is |
| A/V = 2T/L |
| where L is the length of the line segments. |
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Return to scaling in the lungs.