Re: Table A4 + elevation?
Subject: Re: Table A4 + elevation?
From: Paul Hirose (cfuhb-acdgw@XXX.XXX)
Date: Fri May 02 2003 - 12:53:32 EDT
George Huxtable wrote:
>
> Vaguely remembering (or maybe misremembering?) the density (relative to
> water) of air as 1/830 and of Mercury as 13.6, it seems to me that at
> Doug's height of 2100 ft. the atmospheric pressure will be reduced by 7.5%
> below what it is at ground level. (Somebody please check!) If that's
> correct, then the local pressure will reduce to 935 millibars, compared
> with its "standard" sea-level value of 1010. That takes it well outside the
> realms of the diagram that goes with table A4, which goes no further down
> than 970.
At 2100 feet in the 1976 U.S. Standard Atmosphere, pressure is .92641
of sea level. Multiplying that by 1010 mb gives 935.7 mb. Pretty good
estimate, George.
