Boiling of milk in an open vessel is an example of ______________ boiling?
Correct answer: D. Film
- A. None of these
- B. Sub-cooled
- C. Saturated nucleate
- D. Film
Explanation
Milk develops a protein- and fat-rich surface film during heating, which inhibits heat transfer and produces the characteristic film-boiling behaviour and boil-over. It is therefore classified here as film boiling rather than ordinary saturated nucleate boiling.
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