Question

# The highest that George can suck water up a very long straw is 2.0 m. (This is a typical value.) What is the lowest pressure that he can maintain in his mouth?

Solution

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Let $P_0$ be the atmospheric pressure and $P$ be minimum pressure George can maintain. Then the pressure of the water column is the difference between $P_0$ and $P$.

$P_0=1.013\times10^5$ N/m$^2$

Height of water $h=2.0$ m

Density of water $\rho=1000$ kg/m$^3$

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