Eli5: Why can a thermal flask keep items cold for 24 hours, but only hot for 12 hours.
In: Physics
The rate of temperature exchange is proportionate to the gradient. A “Cold” drink on a hot summer day is going to be around 5° when ambient temperatures are 25-30°. A “Hot” drink could be as hot as 100° if it’s freshly brewed tea. So there’s a bigger temperature gradient and thus faster temperature exchange.
Edit: before you whine about “my five year old doesn’t know those words,” save your time and mine and just read one of the 50 such replies already posted
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