🔍 Key Concepts

• Bar to psi conversion (know the rough relationship between metric and English pressure units) • Difference between absolute pressure (psia) and gauge pressure (psig) • Standard atmospheric pressure in both kPa/bar and psi

💭 Think About

• Recall what pressure in psi corresponds to one standard atmosphere, and how close 1 bar is to that value • Think about whether 1 bar is slightly less than, equal to, or more than 1 atmosphere, and adjust the psi value accordingly • Compare each choice with your remembered approximate value; which is closest to the expected psi for 1 bar?

✅ Before You Answer

• Know that 1 atmosphere ≈ 14.7 psia and 1 bar ≈ 100 kPa • Confirm that 1 bar is slightly less than 1 atmosphere, not dramatically different • Eliminate any answer choices that are far from the typical atmospheric pressure value in psi