The peak pressure on a ventilator reads 40 cm H2O. What is the equivalent pressure in mm Hg?
a. 37.0 mm Hg
b. 29.6 mm Hg
c. 68.3 mm Hg
d. 4.9 mm Hg
ANS: B
Because of mercury's high density (13.6 g/cm3), it assumes a height that is easy to read for most pressures in the clinical range. Water columns can also be used to measure pressure (in cm H2O), but only low pressures. Because water is 13.6 times less dense than mercury, 1 atm.
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