REFLECTOR: Air pressure question...

[Jim Sower]

But NOT half your density (since it's a good bit colder). Not a dramatic 
difference, but significant..
Jim S.

J.P. Brooks wrote:

> You will loose half your pressure at 18,000 feet.... half the 
> atmosphere better said
>
>
> At 08:27 PM 6/16/2005, you wrote:
>
>> Hiro,
>> Following is data to 15K
>> Alt in hg PSI
>> SL 29.92 14.7
>> 1000 28.86 14.2
>> 2000 27.82 13.7
>> 3000 26.81 13.2
>> 4000 25.84 12.7
>> 5000 24.9 12.2
>> 6000 23.98 11.8
>> 7000 23.09 11.3
>> 8000 22.23 10.9
>> 9000 21.39 10.5
>> 10000 20.58 10.1
>> 11000 19.8 9.7
>> 12000 19.03 9.3
>> 13000 18.3 9.0
>> 14000 17.58 8.6
>> 15000 16.89 8.3
>>
>>     ----- Original Message -----
>>     From: Hiroo Umeno <mailto:humeno at microsoft.com>
>>     To: Velocity Aircraft Owners and Builders list
>>     <mailto:reflector at tvbf.org>
>>     Sent: Thursday, June 16, 2005 9:34 PM
>>     Subject: REFLECTOR: Air pressure question...
>>
>>     I am not too up on my physics so I would like to pick the
>>     community’s collective brains on a little air pressure question.
>>
>>
>>
>>     The air pressure at sea level is about 14.5psi. What is the air
>>     pressure at, say 20,000ft msl?
>>
>>
>>
>>     Also, what would be the pressure differential (in PSI) at 250KIAS
>>     between Pitot and Static ports?
>>
>>
>>
>>     Thanks.
>>
>>
>>
>>     Hiroo
>>
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