free-air correction

American  

noun

1. a factor used in gravity surveys to compensate for the decrease in the earth's gravitational acceleration as altitude increases, equal to −0.3086 mGal per meter above sea level. Compare Bouguer correction.

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free-air correction Scientific  

/ frē′âr′ /

1. 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.

2. Also called Faye Correction

3. Compare Bouguer correction

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