US Standard Atmosphere Equation
US Standard Atmosphere Equation
(OP)
I am looking for an equation (using the US standard atmosphere) that will allow me to calculate pressure at any altitude in the troposphere (< 11km) when I know the temperature and pressure at another altitude. Standard temperature lapse rate (-6.5K/km) can be assumed or different value to be input.





RE: US Standard Atmosphere Equation
I know the expression that gives you the relation between pressure at an altitude "z" for ISA (International standard atmosphere). I suppose that it be the same as US standard atmosphere. Here it goes:
Pz=Po*[(Tz/To)^(-g/R*k)]
Being:
Pz: pressure at a determined height (m)
Po: pressure at sea level (101325 N/m^2)
Tz: temperature at "z" height. In troposphere: Tz=To+k*z
To: temperature at sea level (288 K is used)
g: gravity (9.8 m/s^2)
R: gas constant (In air medium, take 287 m^2/(s^2)K
k: constant value ; take -6.5*(10^(-3)) K/m
I hope it be useful.
RE: US Standard Atmosphere Equation
RE: US Standard Atmosphere Equation
http://web.usna.navy.mil/~dfr/flttst0.pdf
Here is another link
http://wahiduddin.net/calc/density_altitude.htm