Physics

what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?

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  1. Isn't it to keep the air out and reduce the chance of oxidation?

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    bobpursley
  2. Is there a vacuum under the jars or is it just been air sealed with air already under it?

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  3. There is a vacumn.

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    bobpursley

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