What is the atmospheric pressure when the reading is 7.4" hg?

To determine the atmospheric pressure when the reading is 7.4" hg, we need to understand the relationship between inches of mercury (inHg) and atmospheric pressure. Atmospheric pressure is commonly expressed in various units, with inches of mercury being one of them.

1 inch of mercury is approximately equal to 0.491 psi (pounds per square inch), and standard atmospheric pressure at sea level is about 29.92 inches of mercury. To convert the 7.4" hg into a more usable measure of pressure, we can use the conversion factor:

[ \text{Pressure (psi)} = \text{inHg} \times 0.491 ]

Converting the value:

[ 7.4 , \text{inHg} \times 0.491 , \text{psi/inHg} \approx 3.634 , \text{psi} ]

However, the question is likely asking for atmospheric pressure expressed in another unit, potentially in terms of atmospheres or inches of water which can lead to confusion. When considering the interpretation of units like inches of mercury to other standard pressure measurements, it’s crucial to convert accordingly.

To clarify your answer, while 7.4 inches