SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/pilot-standard-atmosphere

What are standard sea-level temperature and pressure?

15°C (59°F) and 29.92 inches of mercury.

  1. 15°C and 29.92 inches of mercury ✔
  2. 0°C and 30.00 inches of mercury
  3. 20°C and 29.92 inches of mercury

Why: The standard atmosphere is a reference day used for instruments and performance charts. At sea level it is 15°C (59°F) and 29.92 inches of mercury, which is 1013.2 millibars.

Huh, didn't know that: Standard pressure drops about 1 inch of mercury per 1,000 feet of climb, up to 10,000 feet.

The dad joke
Why was the thermometer so smart? It had lots of degrees.
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Sources

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Glossary https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf

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