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A student recorded liquid temperature every five minutes but used different thermometers. What problem may arise?

Answer and explanation

Correct answer: Differences in instrument calibration may make the data inconsistent

The direct answer is B: differences in instrument calibration may make the data inconsistent. Calibration means checking an instrument against a known standard so that its readings are trustworthy. If temperatures are recorded every five minutes with different thermometers, one thermometer may read slightly higher or lower than another even when the liquid has the same temperature. Then an apparent change may come from the instruments rather than the liquid. Option A is wrong because using different thermometers cannot make time stop. Option B is correct because calibration differences can create systematic differences and reduce comparability. Option C is wrong; a colour change is not certain and is unrelated to this measurement issue. Option D is too strong; temperature can still be measured, but the data may be less reliable. Best practice is to use the same suitable calibrated thermometer, keep its position and method constant, and record possible limitations.

Related tags

CalibrationThermometerData ConsistencyMeasurementScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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