The volume breathed out is approximately equal to the volume breathed in ( tidal volume, V T), therefore the net flow over a complete cycle is zero. The symbol for ventilation,, has a dot over the V to show it is a rate. The volume of air passing into the lungs per minute in this case ( minute ventilation, ) is: Normal breathing involves about 12 breaths per minute, each of about 0.5 L. Ventilation of a room or building can be measured as flow of air, in litres per minute through that room. We now begin to explore the detail of this far from uniform phenomenon. So far we have talked about breathing as if it is simply a uniform repeated action of inhalation followed by exhalation.
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