Why does machinery get rust drip? Like.. how?

Question

Sorry if the chemistry flair is incorrect, just sounds about right for something like rusting and reactions.

In: 3

Answer 1

[https://imgur.com/a/wrfE0RR](https://imgur.com/a/wrfE0RR) I don’t know if images work in comments, so here’s a link to what I mean. It’s shown on concrete, but I see this happen with metal too.