Under ISA, what is the standard temperature at sea level?

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Multiple Choice

Under ISA, what is the standard temperature at sea level?

Explanation:
In the International Standard Atmosphere, sea level is defined with a temperature of 15°C. This value serves as the baseline for all ISA calculations, with the atmosphere then cooling at a steady lapse rate of about 6.5°C per kilometer up to about 11 km. So at sea level, the standard temperature is 15°C, not 0°C, 25°C, or -15°C. This 15°C baseline helps pilots and engineers compare performance and conditions using a consistent reference.

In the International Standard Atmosphere, sea level is defined with a temperature of 15°C. This value serves as the baseline for all ISA calculations, with the atmosphere then cooling at a steady lapse rate of about 6.5°C per kilometer up to about 11 km. So at sea level, the standard temperature is 15°C, not 0°C, 25°C, or -15°C. This 15°C baseline helps pilots and engineers compare performance and conditions using a consistent reference.

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