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Questions on high altitude pressures
At low altitudes the rule of thumb is that a one thousand foot
increase in altitude results in a one inch of mercury decrease in pressure; at least that is what happens when I turn the little knob on my altimeter. Since commercial planes flight well into the FL300+ range, clearly that rule cannot hold at altitude as a plane taking off at 29.92 inches would find itself in a vacuum at 29,900 feet above sea level. Can someone with experience of high altitude flight expand on my understanding of pressure variation? Also, since the altimeter in the C182 I fly appears to incorporate that rule of thumb, is it accurate at say, FL120, or is another kind of altimeter needed for planes flying up there? TIA |
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