🔍 Key Concepts

• Standard atmospheric pressure at sea level is a commonly memorized reference value in meteorology and navigation. • Relationship between millibars (mb or hPa) and inches of mercury (inHg). • Which of the options looks closest to the widely used "standard" value on weather charts and barometers.

💭 Think About

• Think about the barometer reading that is considered "normal" at sea level on standard weather charts: is it closer to 1000 mb or a slightly higher value? • Do you recall the common conversion between 29.92 inches of mercury and millibars? Which millibar value is associated with 29.92 inHg? • Among the choices, which value is most often cited in textbooks as the standard sea-level pressure used for calibrating instruments?

✅ Before You Answer

• Convert 29.92 inHg to millibars using the approximate factor 1 inHg ≈ 33.86 mb and see which option matches best. • Check which option is closest to the typical "normal" sea-level pressure used in standard atmosphere tables. • Verify that 760.0 is usually expressed in millimeters of mercury (mmHg), not in millibars, and see how that helps eliminate one option.