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Convert 55 psig to absolute pressure.

Select one:

A. 55 psig [tex]$- 30 = 25$[/tex] psia (rounded)

B. 55 psig [tex]$+ 15 = 70$[/tex] psia (rounded)

C. 55 psig [tex]$- 15 = 40$[/tex] psia (rounded)

D. 55 psig [tex]$+ 30 = 85$[/tex] psia (rounded)

Answer :

To convert gauge pressure (psig) to absolute pressure (psia), you need to add the atmospheric pressure to the gauge pressure. Atmospheric pressure at sea level is approximately 14.7 psi, but typically rounded to 15 psi for these types of calculations.

Here's the step-by-step process:

1. Identify the gauge pressure: In this case, the gauge pressure is 55 psig.
2. Add the atmospheric pressure: The atmospheric pressure is approximately 15 psi.
3. Calculate the absolute pressure: Add the gauge pressure to the atmospheric pressure.

[tex]\[
\text{Absolute Pressure (psia)} = \text{Gauge Pressure (psig)} + \text{Atmospheric Pressure (psi)}
\][/tex]

[tex]\[
= 55\ \text{psig} + 15\ \text{psi} = 70\ \text{psia}
\][/tex]

Therefore, the correct answer is:
B. 55 psig + 15 = 70 psia (rounded)

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