Iron can rust when it is exposed to oxygen. What method could be used to prevent iron from rusting?

You have a few choices:

- - Take it out of Earth's atmosphere.

- - Put it in a tank where you pumped all the air out of it.

You can put whatever you want back in the tank, just

as long as there's no oxygen in there.

- - Besides oxygen, rusting also needs water. The humidity

(water vapor) in the air is enough to do it. So if you can

keep the air totally, totally dry around the iron, then the

oxygen alone won't make it rust.

- - All these choices do the same thing: Make sure that

oxygen and water vapor can't reach the iron. The easy

way to do that is to paint or spray something onto the

surface of the iron that keeps the air away from it.

Put the iron where there are no oxygen, like space, the moon, the ISS, or put it underground compact dirt will kee all oxygen away, make sure where you bury it that it is completely dry.