Why do thermos flask bottles advertise 24hrs cold and 12hrs hot. Shouldn’t it be the same amount of time for temps in both directions?
In: 1049
The difference in temperature determines how fast heat transfers.
Ice water at 0 C is 25 degrees C from 25 C room temperature.
Hot water at 80-100 C is 55-75 degrees C from 25 C room temperature.
Hot water is more than double the temperature difference of cold water, so it changes temperature faster. Thus, the water inside will remain hot for a shorter time than cold water remains cold.
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