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Old 21st Mar 2006, 15:51
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Three Blades
 
Join Date: Jan 2005
Location: UK
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For a very rough answer only:
1) Sea level is 1000mb
2) Pressure falls by 1mb for every 30'
So for 10k' the pressure will be 330 (to 2 sig figs) less than 1000 = 670
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