What are the standard atmosphere sea-level temperature and pressure reference values?

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Multiple Choice

What are the standard atmosphere sea-level temperature and pressure reference values?

Standard atmosphere uses sea-level conditions of 15°C (59°F) and 1013.25 hPa (29.92 inHg) as the reference values. This baseline is what meteorology and aviation adopt for calculations involving air density, altimeter settings, and other ISA-related properties. The other options mix in temperatures or pressures that are not the defined sea-level reference, such as freezing point 0°C, or rounded/altered pressures like 1013 hPa, 1000 hPa, or 1015 hPa. Therefore, the correct reference pair is 15°C and 1013.25 hPa.

Standard atmosphere uses sea-level conditions of 15°C (59°F) and 1013.25 hPa (29.92 inHg) as the reference values. This baseline is what meteorology and aviation adopt for calculations involving air density, altimeter settings, and other ISA-related properties. The other options mix in temperatures or pressures that are not the defined sea-level reference, such as freezing point 0°C, or rounded/altered pressures like 1013 hPa, 1000 hPa, or 1015 hPa. Therefore, the correct reference pair is 15°C and 1013.25 hPa.

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