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A refrigerant properties chart calls for 100 psia. The reading you would see on your gauges is:

Select one:
A. 100 psia - 15 psig = 85 psig (rounded).
B. 100 psig.
C. The pressure reading cannot be determined without knowing the refrigerant.
D. 100 psia + 15 psig = 115 psig (rounded).

Answer :

Certainly! Let's go through the solution step-by-step.

Given:
- The property chart calls for 100 psia (pounds per square inch absolute).

We need to determine what reading you would see on your gauges.

To start, we should understand the difference between psia (pounds per square inch absolute) and psig (pounds per square inch gauge).

- psia is the absolute pressure, which includes the atmospheric pressure.
- psig is the gauge pressure, which does not include atmospheric pressure.

Atmospheric pressure at sea level is approximately 14.7 psia.

To convert from psia to psig:
[tex]\[ \text{psig} = \text{psia} - \text{Atmospheric Pressure} \][/tex]

Step-by-step solution:
1. Given absolute pressure (psia) = 100 psia.
2. Atmospheric pressure = 14.7 psia (at sea level).

Now, calculate the gauge pressure:
[tex]\[ \text{psig} = 100 \, \text{psia} - 14.7 \, \text{psia} \][/tex]
[tex]\[ \text{psig} \approx 85.3 \approx 85 \, \text{psig} \][/tex]

Thus, the reading you would see on your gauges is approximately 85 psig.

The correct answer is:
A. 100 psia - 15 = 85 psig (rounded).

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