Is it possible to get a perfect vacuum?

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superbebisen .

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Is it possible to get a perfect vacuum?
« on: 20/07/2016 11:57:34 »
superbebisen .  asked the Naked Scientists:
   Is it possible to get a perfect vakuum?//Ludvig

   
What do you think?
« Last Edit: 20/07/2016 11:57:34 by _system »

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Offline evan_au

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Re: Is it possible to get a perfect vacuum?
« Reply #1 on: 20/07/2016 12:40:19 »
No vacuum is ever perfect.

Air is always leaking through seals, and volatile molecules are always emitted from rubber seals, and occasional atoms will come off metal surfaces. But science experiments like the LHC spend a lot of effort to produce a lot of nothing (ie a big vacuum).

I understand that one of the best man-made vacuums was achieved by placing a metal plate in Earth orbit. There was very little gas at the orbital altitude. The plate deflected any remaining gas molecules, leaving a very good experimental vacuum in the space just behind the plate.

Even if you eliminate all gas molecules, there is always light, heat, cosmic rays and neutrinos passing through.

Some measures of vacuum quality are shown here:
https://en.wikipedia.org/wiki/Vacuum#Examples