Cryogenics Traditional Cache
heebinator: Big ugly nasty spider.
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Cryogenics is the study of how to get to low temperatures and of how materials behave when they get there. Besides the familiar temperature scales of Farenheit and Celsius (Centigrade), cryogenicists use other temperature scales, the Kelvin and Rankine temperature scales.
One interesting feature of materials at low temperatures is that the air condenses into a liquid. The two main gases in air are oxygen and nitrogen. Liquid oxygen, "lox" for short, is used in rocket propulsion. Liquid nitrogen is used as a coolant. Helium, which is much rarer than oxygen or nitrogen, is also used as a coolant.
One idea that keeps showing up in science fiction is: "Wouldn't it be neat if we could freeze people and then revive them?" That idea was used, for instance, in the Stanley Kubrick/Arthur C. Clarke movie "2001: A Space Odyssey". There is a field devoted to freezing people, called cryonics. It's currently used for freezing people who die of diseases that, they hope, will be curable by the time scientists learn how to revive people. At present, though, reviving people has been successful only in science fiction. And not even all the time there, if you remember what happened in "2001"...
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