Why are thermos’s better at keeping things cold rather then keeping things hot ?
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The larger the temperature difference between your drink and room temperature, the longer it takes for the drink to reach room temperature.
The thing here, is more of your perception. When you get a hot drink like a coffee, it’s going to be really hot. It will cool fast, but is still quite warm (still warmer than room temperature). But you will feel like it isn’t as hot anymore (you are right of course), but it isn’t room temperature. The temperature difference will still be quite high.
A cold drink really isn’t that much colder than room temperature. It’s a drink out of your fridge. Because the difference in temperature isn’t that much, the drink warms more slowly. Even then, you still perceive it as ‘cold’ even if it does warm up a fair amount.
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