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Old 15th October 2010 | 17:01
  #697 (permalink)  
F111UPS767
 
Joined: Sep 2010
Posts: 30
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From: Florida, USA
At 25000ft, the standard barometric pressure is 40 kPa (299 mmHg). This means that there is 39% of the oxygen available at sea level.

39%... What is needed to sustain combustion?

Altitude.org | Altitude air pressure calculator
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