Which of the following is NOT listed as a definition of drift in the material?

• A. Moves off target
• B. Incorrect mix
• C. Changes from solid to gas
• D. Adheres to target

Answer: (D)

Drift is deviation from where the material is supposed to be, whether in position, composition, or behavior during processing. If something drifts, you might see it move off target, reflect an incorrect mix, or even result from a phase change such as solid turning into gas, which can push it away from the intended path. Adheres to target describes the material staying in place as planned, which is not drift—that’s correct placement, not a deviation.