Democratic Sentinel, Volume 19, Number 42, Rensselaer, Jasper County, 25 October 1895 — About Breathing. [ARTICLE]

About Breathing.

In the ordinary respiration of man 10 to 17 cubic inches of atmospheric air parses into the lungs 20 times a minute, or a cubic foot every 5%, minutes—274 cubic feet in 24 hours. The lungs hold 2.80 cubic feet At each respiration 1.875 of oxygen la converted into carbonic acid gas. The nitrogen inspired and expired is exactly equal. During the act of inspiration the lungs have been found to be the coldest part of the body.