if a process changes something into something else, then that something is required for that process
processing is not process. change is when_one_thing_becomes_another_thing. change is thing. mechanism is not chemical_process. irreversible_process is not process. irreversible_process is process. processing is process. reversible_process is not process. change is not when_one_thing_becomes_another_thing. reversible_process is process.