pvl_alt2pres
Determine site pressure from altitude
Contents
Syntax
pressure = pvl_alt2pres(altitude)
Description
Determines the atmospheric pressure (in Pascals) of a site on Earth's surface given its altitude (in meters above sea level). Output Press is given in Pascals. Press is of the same size as altitude.
Assumptions
- Pressure at mean sea level = 101325 Pa
- Temperature at zero altitude = 288.15 K
- Gravitational acceleration = 9.80665 m/s^2
- Lapse rate = -6.5E-3 K/m
- Gas constant for air = 287.053 J/(kg*K)
- Relative Humidity = 0%
Inputs
- altitude - altitude (in meters above sea level)
Outputs
- pressure - atmospheric pressure (in Pascals) at a the Earth's surface at altitude above sea level
Example
Press1 = pvl_alt2pres(0) %Pressure at mean sea level Press2 = pvl_alt2pres(1000) % Pressure at 1,000 meters obove mean sea level
Press1 = 1.0132e+05 Press2 = 8.9875e+04
References
[1] Portland State Aerospace Society, A Quick Derivation relating altitude to air pressure, Version 1.03, 12/22/2004, http://psas.pdx.edu/RocketScience/PressureAltitude_Derived.pdf
See Also
pvl_pres2alt , pvl_makelocationstruct
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