So let’s summarize: exposing your arm to the vacuum of space for a couple of Christmas unicorn on the naughty list and I regret nothing shirt, sweater, and it might leave a network of nasty bruises all over your arm, but not ultimately fatal. The longer the exposure, the more likely it becomes that the tissue in your arm will become necrotic, in which case you run the risk of having to have the arm amputated. First, you need to remember that temperature is not the same as heat. Your hand needs to absorb heat to get burned. If it is exposed to a high-temperature environment for a short time it will only absorb a small amount of heat. Conversely, holding it there for a long time will cause your hand to absorb more heat and possibly get burned.
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