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According to ISA atmospheric model what is the value of datum atmospheric temperature?

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in Aircraft Performance by (558k points)
According to ISA atmospheric model what is the value of datum atmospheric temperature?

(a) 273K

(b) 277K

(c) 288.15K

(d) 288.15°C

This question was addressed to me in an interview for internship.

Asked question is from Vertical Development of Air topic in section Atmosphere and Air Data Measurement of Aircraft Performance

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The correct answer is (c) 288.15K

Easiest explanation: According to ISA atmospheric model what is the value of datum atmospheric temperature is 288.15K. It can also be written as 15.15°C. The relation between Kelvin scale and Celsius scale is K=°C+273.

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