[Jewelry making - Article 00794] - Re: [Orchid] Metal Shrunk by Powerful Magnetic Field?

[Helen Hill]

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>     I thought is a bit wierd, the claim for instance for "identical
>     volume" did not seem to make any sense. 

    The identical volume makes perfect sense. As James Binnion says, we
    cannot compress matter (well not solid or liquid matter anyway - we
    can compress a gas obviously). The mass of the coin will be identical
    to the original mass and the volume of the coin will be identical to
    the original volume, and its density will remain the same, but its 3D
    dimensions will differ from the original. Calculate the volume ((pi x
    radius) squared x thickness) from the new dimensions and they'll be
    the same as the calculated volume of the coin to start with. The
    original quoted explanation of what remained the same an what was
    changed was not very well written. "The resulting quarter maintains
    the same mass, volume, and density, but the size is drastically
    reduced!". The size in one dimension (or two in the case of a circle)
    is reduced but the size in the 3rd dimension (its thickness) is
    increased, therefore maintaining the coin's mass, volume and density.

Helen
UK
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