Results 1 to 3 of 3
  1. #1 Is Baracks Head Completely Empty? 
    PORCUS MAXIMUS Rockntractor's Avatar
    Join Date
    Apr 2009
    Is it possible to make a perfect vacuum?

    Asked by: Dan Klingensmith


    Practically, it is impossible to make a perfect vacuum. A perfect vacuum is defined as a region in space without any particles.

    The problem is that to maintain a vacuum in a region you have to shield it from the environment. It is not difficult to make a container that would prevent atoms from entering the region.

    The first problem is that the container itself will radiate photons (which in turn can create electron positron pairs in the vacuum) if it is not kept at a temperature of 0K. Note that a perfect vacuum has by definition a temperature of 0K. reaching 0 K is practically impossible.

    The second problem is that there are weakly interacting particles that could enter the region. No matter how thick the walls of the container are, there is always a finite probability that, say, a neutrino would enter the region.

    Answered by: Saibal Mitra, M.S., Physics Grad Student, UVA Amsterdam
    Basically no matter how thick his scull is and how cold and unfeeling he is, he still does not approach a perfect vacuum. There is always a chance of a photon or some other sub atomic particle bouncing around inside his empty vacuous head.
    The difference between pigs and people is that when they tell you you're cured it isn't a good thing.
    Reply With Quote  

  2. #2  
    Senior Member DumbAss Tanker's Avatar
    Join Date
    Jun 2002
    Quarky sense of humor, if you ask me.
    Reply With Quote  

  3. #3  
    Power CUer FlaGator's Avatar
    Join Date
    Apr 2004
    The Swamps of N. Florida
    Neutrino's are smart enough to be "only passing through" type particles.
    For we are to God the aroma of Christ among those who are being saved and those who are perishing.
    To the one we are the smell of death; to the other, the fragrance of life. And who is equal to such a task?
    2 Corinthians 2:15-16
    Reply With Quote  

Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts