• A standard reference value for air pressure:
  • Atmosphere (unit)
    Atmosphere (unit)
    The standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of pressure. For practical purposes it has been replaced by the bar which is 105 Pa...
    
    , an approximation of the value at sea level
  • Atmospheric pressure, other reference values
• A model of how atmospheric pressure
  Atmospheric pressure
  Atmospheric pressure is the force per unit area exerted into a surface by the weight of air above that surface in the atmosphere of Earth . In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point...
  
   varies with altitude:
  • The U.S. Standard Atmosphere, a series of models that give values for pressure, density, and temperature over a range of altitudes
  • The International Standard Atmosphere
    International Standard Atmosphere
    The International Standard Atmosphere is an atmospheric model of how the pressure, temperature, density, and viscosity of the Earth's atmosphere change over a wide range of altitudes. It has been established to provide a common reference for temperature and pressure and consists of tables of...
    
     (ISA), an international standard model, defining typical atmospheric properties with altitude, at mid-latitude

See also

• Atmospheric models
  Atmospheric models
  Static atmospheric models describe how the ideal gas properties of an atmosphere change, primarily as a function of altitude....
  
  
• NRLMSISE-00
  NRLMSISE-00
  NRLMSISE-00 is an empirical, global model of the Earth's atmosphere from ground to space. It models the temperatures and densities of the atmosphere's components. A primary use of this model is to aid predictions of satellite orbital decay due to atmospheric drag...
  
  
• Standard conditions for temperature and pressure
  Standard conditions for temperature and pressure
  Standard condition for temperature and pressure are standard sets of conditions for experimental measurements established to allow comparisons to be made between different sets of data...