ANSWERS: 2
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Heating and cooling. I understand it to be some sort of piping system. ------ Keep in mind that without air, there is no convection and little conduction ---the difference between putting your hand in a hot oven for a minute to that of a pot of boiling water for 30 seconds. ------ Most of the heat is in the form of radiation.
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About a month ago I went to NASA Glenn to meet Astronaut Lee Morin. I think he said they used tubes filled with water to keep them cool. Check out this link. http://quest.arc.nasa.gov/space/teachers/suited/9d3keep.html
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