alpha2cen Posted July 18, 2011 Share Posted July 18, 2011 (edited) In the perfect vacuum, there is no molecules in it, and the vacuum has no surround objects, i.e., too far away from the heat sources. As CMB theory, it is about 4K. Which one is correct 0K or 4K? If a vacuum is 4K, how can we drop the temperature to 0K? Edited July 18, 2011 by alpha2cen Link to comment Share on other sites More sharing options...
Fuzzwood Posted July 18, 2011 Share Posted July 18, 2011 We can't. Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted July 18, 2011 Share Posted July 18, 2011 In the perfect vacuum, there is no molecules in it, and the vacuum has no surround objects, i.e., too far away from the heat sources. As CMB theory, it is about 4K. Which one is correct 0K or 4K? If a vacuum is 4K, how can we drop the temperature to 0K? A "perfect" vacuum would not even have photons in it. Nothing would remain that could define a temperature. Link to comment Share on other sites More sharing options...
mathematic Posted July 18, 2011 Share Posted July 18, 2011 As a practical matter, there is no way to avoid photons. Link to comment Share on other sites More sharing options...
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