âSpoons come in many different sizes and are not precise enough to measure a childâs medication,â said pediatrician Ian Paul, MD, FAAP, lead author of the policy statement. âFor infants and toddlers, a small error â especially if repeated for multiple doses â can quickly become toxic.â.
Copper and bronze do not contain any iron, and only iron can rust (because rust is defined as iron oxide, a compound of iron and oxygen); so the answer is that steel will rust the fastest and copper and bronze will never 'rust'. But, yes, copper and bronze do tarnish, they do corrode.
Rust can be a minor annoyance if it stains your clothing or your tools, or it can be a major disaster in buildings and infrastructure. Rust is the result of an electrochemical reaction that is really like a battery; Iron turns to iron oxide with water as the electrolyte, actually making electricity in the process. That's why salt water rusts steel faster than fresh water; the ions move more easily, it's a better electrolyte. The cost of rust is huge; America's bridges alone need $76 billion worth of repairs, and much of that is due to rust. But it also hits us at the more personal level, most obviously in our cars, but also with tools and appliances.