Film condensation is promoted on a/an _______________________ surface?
Correct answer: C. Clean & smooth
- A. Oily
- B. Coated
- C. Clean & smooth
- D. Dirty
Explanation
A clean, smooth surface is readily wetted by the condensate, allowing a continuous liquid film to form, which is film condensation. Oily or coated surfaces tend to discourage wetting and promote dropwise condensation instead.
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