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

The vacuum in a thermos flask helps to reduce heat transfer by?
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A Convection and radiation
  • B Convection and conduction
  • C Conduction and radiation
  • D Radiation only
Correct Answer: Option B
Explanation:

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