Something that is rust resistant will not rust easily; minor exposure to water will not cause it to rust. Something that is rust proof will not rust.
Not exactly. Acid eats iron through a chemical reaction, but oxidation (rust) is something different.
Nails get heavier when they rust because rust is a compound that forms when iron reacts with oxygen in the air. This reaction adds extra mass to the nail in the form of iron oxide, increasing its overall weight.
It's not just saltwater that makes a nail rust, even water makes a nail rust. Rust is simply oxidation, it happens when oxygen comes into contact with something and creates a chemical reaction and creates "oxides". Iron + oxygen = Iron oxide (red rust on steel)
soda does not make iron rust ...
A bike gets heavier after rusting because rust is the result of iron reacting with oxygen in the air to form iron oxide. Iron oxide has a greater mass than iron alone, adding to the weight of the bike.
They DO know something about inorganic chemistry.
soggy and wet conditions can make metal rust
YARP
First make sure that it is indeed rust on your door and not something else. Once you've determined what it is on the door it can be treated. If it is rust, not to worry - there's a lot of good products that will treat it.
pennies don't rust!
rust=air+metal