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<p>[QUOTE=&quot;dcarr, post: 2936245, member: 4781&quot;]If the sandbox was in a sealed and insulated ship far out in space, the same thing would apply, and it would be a &quot;closed&quot; system.</p><p><br /></p><p>But here is yet another explanation:</p><p><br /></p><p>When metal oxidizes, the metal moves. Think of rust bubbles under the paint of an old car. The volume of the bubble has increased because the oxide increases in volume and gaps form between the metal. The bonds between adjacent molecules in the metal have been broken across these gaps. You can chemically reverse the oxidation process to return the metal to un-oxidized iron. But doing so does not restore the bonds between the molecules where the gaps were. Once pushed out of place, the molecules will not go back and bond where they were before.[/QUOTE]</p><p><br /></p>

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