The inner walls of a thermos flask are shiny to reflect infrared radiation back into the liquid, thereby minimizing heat loss through radiation and helping to maintain the temperature of the contents for a longer period.
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Sir James Dewar invented the Thermos flask in 1892. He designed it to minimize heat transfer by creating a vacuum between two layers, effectively keeping liquids hot or cold for longer periods.
The double walls of the shiny inner wall and the outer cover prevent heat from escaping or entering. The thermos flask’s design includes a vacuum between the double walls and a shiny inner surface to minimize heat transfer by conduction, ...
A thermos flask prevents heat loss through all three mechanisms by using a vacuum to stop conduction and convection and a reflective coating on the inner surfaces to minimize radiation, thereby maintaining the temperature of the contents.