First slide

Fluid statics

Question

By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of Hg(density = 13.6 $g / {cm}^{3}$ ). Using the straw, he can drink water from a glass up to a maximum depth of (atmospheric pressure is 760 mm of Hg)

Moderate

A

10 cm
B

75 cm
C

1.36 cm
D

13.6 cm

Solution

Pressure difference between lungs of student and atmosphere = (760-750) mm of Hg
i.e., hdg = 10 mm of Hg = 1 cm of Hg
or h $\times 1 = 1 \times 13.6$
h = 13.6 cm

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