compressibility correction

compressibility correction

[kəm‚pres·ə′bil·əd·ē kə′rek·shən]
(fluid mechanics)
The correction of the calibrated airspeed caused by compressibility error.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

compressibility correction

A correction applied to rectified airspeed to get equivalent airspeed. This correction is always negative but is generally negligible below 200 to 240 knots.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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It has a compressibility correction chart, worldwide time correction chart and an ICAO Standard Atmosphere reference table.