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?
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Cold liquids range down to zero Celsius if you have ice cubes in them. Room temp is about 21 Celsius. Just boiled liquid would be what 90-100 C. So going from 0 to 21 is 21 degrees of temp change of 21 degrees. 90 to 21 is 69 degrees. The bigger temp change means a faster change. So what do we consider cold versus hot versus lukewarm? A hot liquid turns lukewarm faster.
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