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200 liters of air weighs about 240 grams and heats up about as fast as 240 grams of sleeping bag, or 240 grams of yoga mat, I mean in a short time. It was reported that the air never heated up much though. Well that was because the air was moving around and dumping heat into the ground, as still air is one of the best insulators. If a bony person lays ...

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