has input has output environmental material environmental system process material transformation process A different material transformation process class (or similarly named class) pertaining to the conversion of a specific chemical into another belongs in CHEBI and or REX ontologies. A process during which a portion of some environmental material is converted into a different material or a collection of materials. http://orcid.org/0000-0002-3410-4655 Experimental class for structural purposes not recommended for annotation. A material transformation process only refers to ENVO:environmental material classes (e.g. bulk and typically impure substances), rather than transformations converting a specific chemical into another. envoPolar