🔍 Key Concepts

• Difference between PSIG (pounds per square inch gauge) and PSIA (pounds per square inch absolute) • Standard atmospheric pressure value in psi under normal conditions • How to convert from gauge pressure to absolute pressure using a simple formula

💭 Think About

• What does the "G" in PSIG mean about what the gauge is measuring relative to the atmosphere? • If standard atmosphere is about 14.7 psi, how would you combine that with the given 208.7 PSIG to get an absolute pressure? • Once you do the conversion, which answer choice is closest to your calculated PSIA value?

✅ Before You Answer

• Be sure you are using standard atmospheric pressure ≈ 14.7 psi in your calculation • Remember that absolute pressure includes atmospheric pressure, while gauge pressure does not • Double-check your addition vs. subtraction step before matching your calculated value to the choices