ERROR
DESPITE UTMOST CARE AND
PRECAUTIONS AN EXPERIMENTER MAY TAKE TO ELIMINATE ALL POSSIBLE ERRORS, THE
HAPPY GOAL IS SELDOM ATTAINED AND CERTAIN ERRORS ARE BOUND TO CREEP IN FOR
EXAMPLE, EVEN IN AN APPARENTLY SIMPLE
MEASUREMENT OF FLOW VELOCITY WITH A PITOT TUBE ANY MISALIGNMENT OF THE PROBE,
LEAKS IN THE PRESSURE TUBING, CHANGES IN THE BORE AND SURFACE CONDITIONS OF THE
MANOMETER, ANY FLUCTUATIONS IN THE ATMOSPHERIC AND STREAM PRESSURE ARE LIKELY
TO AFFECT THE PROBE READINGS AND GIVE RISE TO UNCERTAINTIES .ERRORS AND
UNCERTAINTIES ARE INHERENT IN THE PROCESS OF MAKING ANY MEASUREMENT AND IN THE
INSTRUMENT WITH WHICH THE MEASUREMENT ARE MADE. A STUDY OF ERROR IS IMPORTANT
AS A STEP IN FINDING WAYS OF REDUCING THEM, AND ALSO AS MEANS OF ESTIMATING THE
RELIABILITY OF FINAL RESULTS. THIS CHAPTER PROVIDES A BRIEF DISCUSSION ABOUT
THE NATURE OF ERRORS AND STATISTICAL ACCURACY OF TEST RESULTS.
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