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| TV: Tidal volume | w (PEF) is the maximal flow (or speed) achieved during the maximally forced expiration initiated at full inspiration, measured in litres per second. ===Tidal volume (TV)=== Tidal volume (TV) is the During the normal, tidal breathing a specific volume of air is drawn into and then expired out of the lungs. ===Total Lung Capacity (TLC)=== Total Lung Capacity (TLC) is the maximum v |