What is the tidal volume measurement when the pen of a 9-L water-sealed spirometer moves 25 mm?

a. 0.338 L c. 0.843 L
b. 0.523 L d. 1.043 L


ANS: B
The bell factor for a 9-L water-sealed spirometer is 20.93 mL/mm. Therefore, 20.93 mL/1 mm = X mL/25 mm; X = 523 mL, or 0.523 L.

Health Professions

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