I think it's rust (iron oxide or hydrated iron oxide) because when iron reacts with water and air, rust is the product. At least that's what we were taught in science today!
Iron reacts with oxygen in air to for rust.
If you expose iron to air then it gets rusty but it sure does take ime to get rusty.
pure iron when heated above 2000 C under damp air or steam to form a magnetic oxide
Humidity ... damp air, water from rains.
When iron reacts with air, they form ferric oxide.
The word 'damp' is a verb, an adjective, and a noun.The noun 'damp' is a word for moisture diffused through the air or a substance, or condensed on a surface; a word for a thing.Example as a noun: The damp had penetrated the whole house.Example as a verb: He tried to damp the anger he felt.Example as an adjective: The books got moldy in the damp basement.The noun form of the adjective 'damp' is dampness.Example: The documents were stored away from the dampness.
Iron rusts because it reacts with oxygen. The oxygen in water reacts with iron quicker than oxygen in air, and the air outside is often damp, and there is the rain as well.
Iron can react with water in the presence of air and form rust.
NO! It reacts with air to form iron oxide (AKA rust) and water to form iron hydroxide (AKA rust)
IRON OXIDE.......AKA RUST!
Iron left damp and exposed to oxygen is prone to rust as the iron, water and air react to oxidize iron at the surface of the pan. Drying an iron skillet immediately after washing helps to protect the skillet from rusting.
It forms rust by binding with oxygen. The added weight is the oxygen.