The international standard atmosphere (International Standard Atmosphere) defines the following conditions at the sea level: temperature / pressure / density / temperature gradient

1. 0°C / 1.013 Bar / 1225 g/m3 / 1.98°C per 1000 ft
2. 15°C / 29.92 in.Hg / 1013 kg/m3 / 1.98°C per 1000 ft
3. 15°C / 1013,25 mb / 1.225 kg/m3 / 1.98°C per 1000 m
4. ✓15°C / 1013,25 hPa / 1.225 kg/m3 / - 6.5°C per 1000 mCorrect answer

Explanation

The International Standard Atmosphere (ISA) defines standard conditions at Mean Sea Level (MSL) as: Temperature +15°C, Pressure 1013.25 hPa, Density 1.225…

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