<div class="quote"><i>Jey8000 wrote:
<div class="quote">
<p>Supermensch wrote:
I do think earthbenders are "just mineralbending" (how else could they bend the crystals in the Catacombs?). But they can't bend metals because it's such a different state of being solid than rock and crystal. Metals are a malleable collection of positive ions, held together by valence electrons that freely move between the atoms. All other solid matter, however, is a firm structure of molecules, with the valence electrons locked into stable orbits. This is why metals bend, while rocks break, and why metals conduct heat and electricity so well. You could say that metal is different from non-metallic solids in the same way as plasma differs from non-ionized gases (and these last two are recognized as 2 different phases of matter!).
</p>
</i></div>
See this is the thing when you get too scientific with fiction since its fallible. I don't think their going to take into account the molecular bonds between metals and non-metals and those between metals. However my argument against platinum is just on its malleability not on its corrosion or anything else, also titanium is more abundant on our Earth. While Platinum must be pretty easy to find in order to have been made into the Mecha-tank's armor and those handcuff, even if you're rich platinum is pretty expensive in the real world; today's price (2014/08/26) is $1428.00 USD/Oz (Source:
platinum.matthey.com) and apparently today's price for "ferro titanium" is $6.00 USD/kg (Source:
infomine.com).
</div>
<p>But those molecular bonds are what determines the physical characteristics of the substance! I've seen people say that metal is just "more refined earth". Well, I'm countering that by pointing out that the physical properties are notably different, and that these differences exist because of the <i>fundamental</i> difference in the way these substances take on a "solid" form.
</p><p>As for the platinum business, has it ever been confirmed in the series that they're talking about a specific kind of metal as opposed to that they're just using the name "platinum" as their term for "perfectly refined metal"?
</p>