how does a thermos flask prevent transfer of heat through radiation
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Thermos flasks are able to keep a liquid hot (or cold) for long periods of time. ... Finally, the silvered surfaces reduce heat transfer by radiation because a shiny/light surface is a poor emitter of radiation (and also reflects the heat back into the hot liquid).
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The inside of the liquid container is shiny and not black, preventing heat transfer by radiation. Shiny mirrored surfaces on the inside and outside of the liquid container reflect heat and prevents heat from being lost (good for hot liquids) and reflects heat radiation (good for cold liquids).
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