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).Using the straw, he can drink water from a glass up to a maximum depth of:

Easy

A

10 cm
B

75 cm
C

13.6 cm
D

1.36 cm

Solution

Pressure difference between atmosphere and lungs
= Pressure difference at depth n
$10 mm \times ρ_{Hg} \times g = {hρ}_{w} g \Rightarrow h = 10 mm \times \frac{ρ_{Hg}}{ρ_{w}} = 13.6 cm$

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