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free-air correction

free-air correction in Science
free-air correction
  (frē'âr')   
A compensation factor used in gravitational surveys that takes into account the decrease in the force of gravity with increasing altitude, assuming only air intervenes between the observer and sea level. It is equal to -0.3086 mGal per meter above sea level. Also called Faye Correction. Compare Bouguer correction.
The American Heritage® Science Dictionary
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