What is the reading associated with a pressure of 13.3" hg?

To convert a vacuum pressure of 13.3 inches of mercury (inHg) to a corresponding pressure in pounds per square inch (psi), the understanding of the relationship between pressure, particularly in a vacuum context, is essential.

13.3 inches of mercury represents the pressure as measured below atmospheric pressure. Standard atmospheric pressure is approximately 29.92 inches of mercury, which equates to about 14.7 psi at sea level. To find the gauge pressure at 13.3 inHg, the conversion involves recognizing that this amount of vacuum represents how much less than atmospheric pressure we are dealing with.

The calculation can be approached by first determining the absolute pressure at a vacuum of 13.3 inHg:

1. Subtract 13.3 from 29.92 to find the equivalent pressure in inches of mercury above vacuum:

29.92 inHg - 13.3 inHg = 16.62 inHg.

2. Convert this inch measurement to psi, knowing that 1 inHg is approximately equal to 0.4912 psi:

16.62 inHg × 0.4912 psi/inHg ≈ 8.14 psi.

This is why the choice associated with