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By sucking through a straw, a student can reduce the pressure in his lungs to $750 \mathrm{~mm}$ of $\mathrm{Hg}$ (density $=13.6 \mathrm{~g} / \mathrm{cm}^3$ ). Using the straw, he can drink water from a glass upto a maximum depth of
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$13.6 \mathrm{~cm}$
Pressure difference between lungs and atmosphere $=760 \mathrm{~mm}-750 \mathrm{~mm}=10 \mathrm{~mm}=1 \mathrm{~cm}$ of $\mathrm{Hg}$.
Pressure difference $=1 \times 13.6 \times g=l \times 1 \times g$ of water
i.e., one can draw from a depth of $13.6 \mathrm{~cm}$ of water.
Pressure difference $=1 \times 13.6 \times g=l \times 1 \times g$ of water
i.e., one can draw from a depth of $13.6 \mathrm{~cm}$ of water.
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