What is the volume displacement when the pen of a 13.5-L water-sealed spirometer moves 28 mm?
a. 0.378 L c. 0.586 L
b. 0.563 L d. 1.168 L
ANS: D
The bell factor for a 13.5-L water-sealed spirometer is 41.73 mL/mm. Therefore, 41.73 mL/1 mm = X mL/28 mm; X = 1168 mL, or 1.168 L.
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