How to make air fall to the floor?

Discussion in 'Physics' started by boks, Feb 1, 2009.

  1. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    a) Why doesn't the air in your room fall to the floor?
    b) What could you do to make it fall?


    a) Because the average kinetic energy of the gas molecules is a lot larger than the difference in potential energy between the ceiling and the floor.

    b) No idea...Is it possible?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Drop the temperature to 77K or lower. Put on thermal underwear first.
     
  3. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    B) Inject a lighter gas?
     
  4. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    Lol. Why exactly 77?
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Nitrogen boils at 77.36K. At 77K the "air" is liquid. :)

    In other words, we've lowered the kinetic energy to where the state changes.
     
  6. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    ..........
     
    Last edited: Feb 3, 2009
  7. BillO

    Well-Known Member

    Nov 24, 2008
    985
    136
    The Sun keeps supplying heat. Move earth's orbit out far enough and you will get air all over the floor.
     
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