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Question

# What is the capillary pressure for water in a vertical tube of radius $10 \mathrm{~nm}$. Express your answer in pascals and as a ratio relative to atmospheric pressure.

Solution

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Step 1
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Given:

• Radius of the capillary tube, $r=10 \mathrm{~nm}$
• Surface tension of water, $\gamma=7.3\cdot10^{-2}\mathrm{{{J}}/{{m^2}}}$

We need to find:

• Capillary pressure
• Ratio relative to atmospheric pressure

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