In sub-cooled boiling ?
Correct answer: A. Temperature of the heating surface is more than the boiling point of the liquid
- A. Temperature of the heating surface is more than the boiling point of the liquid
- B. Temperature of the heating surface is less than the boiling point of the liquid
- C. Bubbles from heating surface are absorbed by the mass of the liquid
- D. Very large vapour space is necessary
Explanation
In sub-cooled boiling, the bulk liquid is below its saturation temperature, while the heating surface must be above the local boiling temperature to form bubbles. The bubbles may later condense in the cooler liquid, but the defining condition is the hotter heating surface.
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