Based on the atmospheric temperature data of the U.S. Standard Atmosphere (shown

Question

Based on the atmospheric temperature data of the U.S. Standard Atmosphere (shown below), compute and plot the pressure variation with elevation (km), using MATLAB. Please note that for some segments of the graph (e.g., when the elevation is between 0-11 km), temperature linearly changes with elevation (with a negative or positive slope, ), while for some other segments (e.g when the elevation is between 11-20.1 km), the temperature is constant (isothermal). Remember to convert all temperatures from °C to K. Given information: patm-101 kPa; R-286.9 J/kg.K:- 999 kg/m 90 80.0 km 80 70 61.6 km 60 52.4 km 47.3 km 50 a 40 2.2 km 30 20 20.1 km 11.0 km 10 -120-100 -80-60-40-20 20 Temperature (°C)

Explanation / Answer

In the above question we find pressure at different elevation so by applying this p=rho(1-Lh/T)^gM/R.L

Then from this we got

p=101(1-11.0*10/(273+10))^9.8*0.0289/286.9*11

Through this calculation we find pressure at different elevation hence M=0.0289 Molar mass of dry air in kg/mol.

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