The International Standard Atmosphere is defined by the World
Meteorology Organization and is available on their web pages. The
standard lapse rate is the dry rate (0% relative humidity) as I recall
and is used to convert observed pressures at various elevations to sea
level values. I believe this is what the ICAO cites for their barometric
altimeter specifications, but I'm less familiar with that.
Jim
"Michael D. Payne" wrote:
>
> Steve,
>
> I can quote the International Standard Atmosphere, generally used to
> calibrate instruments for aircraft. It is 15 C at sea level pressure of
> 1013,2 hPa, with a temperature drop of 6,5 C per 1000 m altitude to 11 km
> where it's assumed to remain constant at -56,5 C. Humidity is unknown by
> me.
>
> Mike Payne
....
--
Metric Methods(SM) "Don't be late to metricate!"
James R. Frysinger, CAMS http://www.metricmethods.com/
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