Why Does Rust Change Iron so Much?

You’ll only need a middle-school understanding of physics and chemistry to follow this article. I’ll cover everything but the math.

There are few transformations more radical in nature than the rusting of iron. Corrosion turns iron from a shiny, strong, malleable conductor into a dull, weak, brittle insulator. What I find particularly interesting about the corrosion in metals is that the cause is so…