Their use is necessary for aircraft development, for studying their performance, for comparing the performance of different aircraft and for many other aeronautic and aviation science applications.Ī concept of the standard atmosphere was developed to standardize calibration of pressure in altimeters, for studying the performance of aircraft engines where knowledge of air density, pressure and temperature at mean sea level (MSL) and their distribution as a function of altitude is essential. These models are known as “standard atmospheres”. The Earth’s atmosphere is constantly changing, therefore, hypothetical models were developed as an approximation of what may be expected assuming the air does not contain dust or moisture and there is no winds or turbulence. Definitions, Constants, and Formulas Used in Calculations
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