Explain how the thermos flask prevent heat loss by: conduction
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The vacuum between the glass walls prevents heat loss by preventing radiation. Hint: A vacuum flask or thermos flask is designed so that it will not allow heat loss by any means of conduction or radiation. The vacuum prevents the heat loss by conduction because vacuum is a bad conductor of heat.
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The flask is designed to prevent heat loss by conduction, convection and radiation. The inner glass walls are silver coated to reduce emitted radiation. The vacuum between the glass walls prevents heat loss by conduction and convection.
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