Eli5: Why can a thermal flask keep items cold for 24 hours, but only hot for 12 hours.
In: Physics
Cold or hot doesnt exists, its relative to another measure. So its all about temperature gradient. If its winter, it can stay cold for a month. So cold is like 5C in a 25C environment where hot is 100C in the same environment. Gradient is larger, so its cooling faster. The larger the gradient, the faster the exchange.
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