Multiple choice

In a vacuum flask silvering reduce the loss of heat by

  1. preventing entry of air.

  2. convection.

  3. chocking the leaking of heat.

  4. prevention of the radiation of heat.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The silvered surfaces of a vacuum flask reflect infrared radiation back into the flask or away from it, minimizing heat transfer. This is effective because shiny surfaces are poor emitters and good reflectors of thermal radiation.

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