Tue Mar 18, 2003 11:49 am by Norfleet
Actually, thing in space will NOT get nasty freeze burn.
Space, while reputedly cold, is not actually truly "cold", so to speak. Space is a vacuum, and lacks any real sense of temperature or heat, in and of itself. Objects which are unheated in space will slowly cool, but this is not a rapid process like being exposed to liquid nitrogen, for these reasons:
For an object to cool, it must transfer the heat away from itself. On Earth, this can occur via radiative or conductive/convective processes. The latter is much more effective: The heat is tranferred into the surrounding medium, such as water, or air. With a fluid medium such as air, the heat is transferred to the air, which then rises, and is replaced by cooler air. The process repeats, and the object cools. In short, this group of processes involves heat being transferred through physical contact with a cooler substance.
In a radiative process, the object cools through the emission of radiation. All objects constantly undergo this process, emitting infrared, and, in the case of extremely hot objects, even visible radiation. This process, however, is slow.
In space, due to the lack of a contacting medium, as space is a vacuum, an object can cool only via radiation. As I stated above, this process is slow. As a result, an object in space will actually cool very slowly. Vacuum is actually a very good insulator, which is precisely why the inner walls of Thermos bottles are evacuated.