Answer
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Step 1: Recall the conversion factor between inches of mercury and psi.
The conversion factor is as follows: 1 extext{~inch of mercury} = 25.4 imes 10^{- 3} extext{~psi}
Step 2: Use the conversion factor to convert 20 inches of mercury to psi.
20 extext{~inches of mercury} = 20 imes (25.4 imes 10^{- 3} extext{~psi/inch of mercury}) = 0.508 extext{~psi}
Final Answer
20 inches of mercury is equivalent to 0.508 psi.
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