STANDARD ATMOSPHERE (TROPOSPHERE)

Standard Atmosphere (Troposphere)

• The pressure at zero altitude is p_o = 1013.250 mb.
• The temperature at zero pressure-altitude is T_o = 288.15K
• The lapse rate of temperature is constant.



• The standard atmosphere satisfies ideal gas law





where is the density of the air and R_d is the gas constant for dry air (= 287.04 J kg^-1 K^-1).

• The standard atmosphere is hydrostatic





where g is the acceleration due to gravity and is constant (= 9.80665 m s^-2) if z is measured in geopotential height.

Pressure-Height Relationship in Standard Atmosphere

pressure-height (p, z) relationship can be found by integrating the above equation :

Density-Height Relationship in Standard Atmosphere

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Pressure Altitude (also see  http://hurri.kean.edu/~yoh/calculations/altimeter)

Input :pressure reading
Output : the height will be the pressure altitude

Density Altitude (also see  http://hurri.kean.edu/~yoh/calculations/altimeter)

Input :density reading (calculated from pressure and temperature using ideal gas law, see  http://hurri.kean.edu/~yoh/calculations/idealgas  )
Output : the height will be the density altitude

• The calculations is performed between -500 meter to 11000 meter of the troposphere.
• All quantities must be in SI units.  For help, try the Unit Conversion Calculators at : http://hurri.kean.edu/~yoh/calculations/units
• Input One of the following and hit ENTER

Report any errors in the calculators or send any suggestions to yoh@hurri.kean.edu

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