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According to ISA atmospheric model what is the value of datum atmospheric pressure in N/m^2?

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According to ISA atmospheric model what is the value of datum atmospheric pressure in N/m^2?

(a) 101325

(b) 101335

(c) 101336

(d) 101326

The question was asked during an online interview.

My query is from Characteristics of Atmosphere in chapter Atmosphere and Air Data Measurement of Aircraft Performance

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The correct option is (a) 101325

The explanation is: According to ISA atmospheric model what is the value of datum atmospheric pressure is 101325 N/m^2. It can also be written in 1atm or 1.01325 bar or 101325 Pascal. The conversion of N/m^2 to bar is 1 bar=10^5 N/m^2. The conversion of bar to Pascal is 1 bar=1 Pascal.

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