Asked by Mikal

what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?
Answered by bobpursley
Isn't it to keep the air out and reduce the chance of oxidation?
Answered by Mikal
Is there a vacuum under the jars or is it just been air sealed with air already under it?
Answered by bobpursley

There is a vacumn.
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