Today I first learned that they can measure one's breath and give it a certain value......
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Look up "pulmonary function testing".
There are special machines that you breath into which measure the volume of the breath and other measurements.
This testing is done to diagnose asthma or restrictive lung disease.
There are special machines that you breath into which measure the volume of the breath and other measurements.
This testing is done to diagnose asthma or restrictive lung disease.