Insulation of liquid surface can be achieved by _____________ on top of its surface?
Correct answer: A. Floating hollow polypropylene spheres
- A. Floating hollow polypropylene spheres
- B. Spraying alumina powder
- C. Putting cement
- D. None of these
Explanation
A layer of floating hollow polypropylene spheres covers the liquid surface, reducing exposed area and limiting evaporation and heat transfer. Powder or cement would contaminate or interfere with the liquid rather than provide a practical floating insulation layer.
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