When converting 20 PSIG to absolute pressure in inches of Hg, what is the resulting value?

To convert gauge pressure (in psig) to absolute pressure, first, it's essential to understand the relationship between gauge pressure and absolute pressure. Gauge pressure is measured relative to atmospheric pressure, while absolute pressure is measured relative to a complete vacuum. The atmospheric pressure at sea level is approximately 14.7 psi.

To perform the conversion, you would add the atmospheric pressure to the gauge pressure:

1. Starting with the given gauge pressure of 20 psig:

• Absolute pressure (in psi) = Gauge pressure + Atmospheric pressure

• Absolute pressure = 20 psig + 14.7 psi = 34.7 psi

2. Next, to convert psi to inches of mercury (inHg), you can use the conversion factor where 1 psi is approximately equal to 2.036 inches of mercury:

Absolute pressure in inches of mercury = Absolute pressure in psi × 2.036

• Absolute pressure in inHg = 34.7 psi × 2.036 inHg/psi ≈ 70.6 inHg

When rounded, this value results in approximately 70 inHg. Therefore, the resulting value after conversion from 20 PSIG to absolute pressure in inches of mercury is correctly identified