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Is it practically possible to construct a closed system?

  1. Feb 4, 2015 #1
    In practice, is a closed or isolated system possible?
    My friends keep saying No, but isnt a system inside say, a vacuum isolated?
    There is no outer atmosphere for transfer of energy to take place.
     
  2. jcsd
  3. Feb 4, 2015 #2
    No, you can't have a perfectly isolated system. In the case of a vacuum, thermal radiation will be emitted by the inner surface of the vacuum chamber and reach the system that way. The most obvious (and important for humans!) example of this is the sun.
     
  4. Feb 4, 2015 #3
    How can radiation be transmitted without a medium??
     
  5. Feb 4, 2015 #4
    How does sunlight reach Earth? There's a vacuum between the earth and the sun. Electromagnetic radiation does not require a medium.
     
  6. Feb 4, 2015 #5
    Aaah yeah! Thanks
     
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