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    Re: U.S. Standard Atmosphere Supplements
    From: Marcel Tschudin
    Date: 2005 Aug 30, 22:31 +0300

    Marc, thank you for information
    > There is also an International Standard Atmosphere (ISA) published by
    > the International Civil Aviation Organization (ICAO). This is used
    > for aircraft performance calculations. Standard sea-level temperature
    > and pressure are 15C and 1013.25 HPa
    
    To my knowledge, these standard conditions you indicate are more often used
    than those of the Nautical Almanac, i.e. 10C and 1010hPa; and there are
    still other standard conditions. One has to be careful when comparing data
    from different sources. Referring the two graphs, which might be out of the
    U.S. Standard Atmosphere Supplement: Since the temperature profiles
    represent averaged data they might also be related to averaged pressures.
    
    Marcel
    
    
    

       
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