Multiple choice

In a thermos flask, attempt is made to reduce losses by

  1. conduction only

  2. convection only

  3. conduction & convection

  4. conduction, convection & radiation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A thermos flask is designed to minimize heat transfer by all three methods: the vacuum between the walls prevents conduction and convection, while the silvered surfaces reflect heat to minimize radiation.

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