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Pourbaix diagram of aqueous iron. Outside chemistry, ferrous is an adjective used to indicate the presence of iron. The word is derived from the Latin word ferrum (iron). Ferrous metals include steel and pig iron (with a carbon content of a few percent) and alloys of iron with other metals (such as stainless steel).
Key Differences. The term ferrous gets defined as the metal that consists of iron or has iron in its constituents, whereas when it comes to chemistry the iron with a valence electron that exists in a pair. On the other hand, the term ferric gets defined as the metal or a substance that relates to rolling in some way or the other.