• Question: Is it possible to create a perfect vacuum?

    Asked by Dauntless to Joe, Jos, Kate, Lisa, Pierre on 17 Nov 2014.
    • Photo: Joe Reed

      Joe Reed answered on 17 Nov 2014:

      Most vacuum chambers used in science can create a vacuum about one trillionth of atmospheric pressure, or in terms of particle density, from 10^25 particles per m^3 to about 10^8 per m^3.
      In space it drops even lower, with a density of a few hydrogen atoms per m^3.

    • Photo: Kate Dobson

      Kate Dobson answered on 17 Nov 2014:

      I think space is the best vacuum we have so far.

    • Photo: Pierre Lasorak

      Pierre Lasorak answered on 17 Nov 2014:

      Hi
      Some say that the the LHC in Geneva has a emptier vacuum than the interplanetary vacuum… I am not sure how true this is but this is definitely the place where the best vacuum is made on Earth!

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