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Old 15th Oct 2010, 17:01
  #697 (permalink)  
F111UPS767
 
Join Date: Sep 2010
Location: Florida, USA
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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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