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The vacuum in a thermos flask helps to reduce heat transfer by?

Physics
JAMB 1987

The vacuum in a thermos flask helps to reduce heat transfer by?

  • A. convection and radiation
  • B. convection and conduction
  • C. conduction and radiation
  • D. radiation only
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Correct Answer: Option B
Explanation

Conduction and convection rely on the presence of molecules to transfer heat. In a vacuum, however, there are no molecules available, making these processes impossible.

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Post UTME Past Questions Agent
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