To convert from mm Hg to atmospheres, we can use the conversion factor: 1 atm = 760 mm Hg. So, we have:
$$
699\,\text{mm Hg} \times \frac{1\,\text{atm}}{760\,\text{mm Hg}} = \frac{699}{760}\,\text{atm}
$$
b. To convert from psi to mm Hg, we can use the
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