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Discussion

Environmental error arises from

  • A.the observer's habit of reading from one side
  • B.the instrument's own internal construction
  • C.the quantity being measured varying with time
  • D.the conditions in which the instrument is used

Answer: D

Temperature, humidity, stray fields and mechanical vibration all shift a reading, and the correction for each has to be known before the measurement is trusted. Shielding and temperature control are the usual remedies.

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