Why are thermos’s better at keeping things cold rather then keeping things hot ?
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Basically, because hot drinks are more hot than cold drinks are cold.
You see, the heat lost (or gained) depends on how different the temperature of the liquid is from the temperature of the air outside it. The greater the difference, the quicker your stuff will heat up or cool down.
A cold drink might be around 32 degrees if it has ice in it (using US temps), and the air is around 72. That’s 40 degrees difference. A hot drink, like coffee, should be around 175 degrees, which is 103 degrees hotter than the air. It will lose heat over twice as fast as the cold drink heats up. So when your cold drink is 42 degrees, which is about the temperature inside your refrigerator, your coffee might be 150, which is a bit colder than most people like their coffee.
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