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By sucking through a straw, a student ca...

By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of Hg (density `=13.6 g cm^(-2))`. Using the straw, he can drink water from a glass upto a maximum depth of.

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Pressure difference between atmosphere and lungs
`DeltaP = 760 -750 10 mm = 1 cm of Hg`
Maximum depth upto which the student can suck
water from a glass `= 1 xx 13.6 = 13.6 cm`
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