**Step 1. **Area in in^{2}

$\mathbf{A}\mathbf{=}(25\mathrm{cm})(25\mathrm{cm})\phantom{\rule{0ex}{0ex}}\mathbf{A}\mathbf{=}\mathbf{625}\mathbf{}\overline{){\mathbf{cm}}^{\mathbf{2}}}\mathbf{\times}{\left(\frac{1\mathrm{in}}{2.54\overline{)\mathrm{cm}}}\right)}^{\mathbf{2}}$

Assume the top of your head has a surface area of 25 cm × 25 cm.

How many pounds of air are you carrying on your head if you are at sea level? Express your answer to two significant figures and include the appropriate units.

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