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What is the value of characteristic gas constant(R) in Nm/kg-K?

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What is the value of characteristic gas constant(R) in Nm/kg-K?

(a) 287.05287

(b) 2.8705287

(c) 2870.5287

(d) 2.8705287

I got this question in examination.

I would like to ask this question from Characteristics of Atmosphere in chapter Atmosphere and Air Data Measurement of Aircraft Performance

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The correct choice is (a) 287.05287

For explanation: The value of characteristic gas constant(R) is 287.05287 Nm/kg-K and the value of universal gas constant (R0) is 8.3145 J/mol. The relation between them is R=\(\frac{R0}{M}\) , where R0 is universal gas constant; R is characteristic gas constant and M is molecular weight of the substance.

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