The bell factor for a 9-L water-sealed spirometer bell is _____ mL/mm
a. 13.5 c. 20.93
b. 29.3 d. 41.73
ANS: C
The bell factor is the number of milliliters of gas that must be displaced to cause the kymographic pen to move 1 mm. The bell factor for a 9-L bell is 20.93 mL/mm.
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