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[QUOTE]Originally posted by Daniel Butler: [QB] It has a temperature, MinutiaeMan, because there is some gas out there (see the wiki on the heliopause, btw, its very interesting) but it's very very low. If memory serves, somewhere around -450*C. But the vacuum the scientist was exposed to would have a similar temperature. What you must remember is that 'cold' is the absence of heat; in other words, if you're in a cold room, what you mean is that the temperature in the room is lower than your body temperature so that you're losing heat to the air around you. In space you can't lose heat via convection (very efficiently) but you do lose heat by radiation. However it'd take hours and hours to freeze in that fashion - maybe days, I haven't done the math. The boiling effect is because when you lower the pressure of a liquid enough, it will phase to a gas to fill the vacuum (and actually, that takes heat energy to accomplish, so as your spit boiled your tongue would feel cold, not hot). That's what happens when you crack your knuckles, according to a study John Hopkins did a while back - you lower the pressure of the fluid in the joints enough that some of it turns to a gas, creating bubbles. It happens very suddenly, hence the crack. [/QB][/QUOTE]
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