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[ventilatio, an airing]

1. The movement of air into and out of the lungs.
2. Circulation of fresh air in a room and withdrawal of foul air.
3. In physiology, the amount of air inhaled per day. This can be estimated by spirometry, multiplying the tidal air by the number of respirations per day. An average figure is 10,000 L. This must not be confused with the total amount of oxygen consumed, which is on the average only 360 L/day. These volumes are more than doubled during hard physical labor.

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