The temperature of a liquid is being measured by a line operator. Which is least likely to be influenced by the instrument?

Question

Options

• ARecording the measurement
• BActual temperature of the liquid
• CCalibration of the instrument
• DReading of the instrument

• A
  75% (12)
• B
  6% (1)
• C
  6% (1)
• D
  13% (2)

Explanation

Recording the measurement (A) is a clerical act performed entirely by the line operator - they simply write down what they see, and the instrument plays no role in whether they transcribe the number correctly or legibly. In contrast, calibration (C) and reading (D) are directly tied to the instrument itself: a poorly calibrated instrument skews the reading it displays, and that displayed reading is a direct output of the instrument's function. The actual temperature of the liquid (B) can be subtly influenced by the instrument - for example, inserting a cool thermometer into a small volume of liquid can slightly alter its temperature, making B a possible (if minor) instrument influence. A helpful memory tip: think of the instrument's sphere of influence as everything it touches or displays - calibration, readings, and physical contact with the liquid all fall within that sphere, but the operator's pen and notepad do not.

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