The heat flows from inside to the outside direction because of lowering of temperature inside the thermos.
How the temperature of ice drops?
When a thermometer is suspended in an insulated thermos that contain a block of ice, the temperature recorded on the thermometer drops, the direction of heat flow is from inside to the outside the thermos. This is because of the insulating material in which the ice is kept and the lowering of the temperature.
So we can conclude that the heat flows from inside to the outside direction because of lowering of temperature inside the thermos.
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