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Convert 55 psig to absolute pressure.

Select one:

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

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

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

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

Answer :

To convert pressure from psig (pounds per square inch gauge) to psia (pounds per square inch absolute), you need to add atmospheric pressure to the gauge pressure. Atmospheric pressure at sea level is approximately 14.7 psi, which is often rounded to 15 psi for simplicity in calculations.

Here's a step-by-step explanation of how you can convert 55 psig to absolute pressure (psia):

1. Understand the terms:
- PSIG (gauge pressure): This is the pressure measurement that doesn't include atmospheric pressure.
- PSIA (absolute pressure): This pressure includes atmospheric pressure.

2. Add Atmospheric Pressure:
- Begin with the given gauge pressure, which is 55 psig.
- Add atmospheric pressure (approximately 15 psi) to this value.

3. Calculate Absolute Pressure:
- [tex]\( 55 \, \text{psig} + 15 \, \text{psi} = 70 \, \text{psia} \)[/tex]

The absolute pressure is 70 psia.

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

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