if something that contains a thing is changed into something else that doesn't contain that thing, then that thing is lost / destroyed when that something changes into that something else
another_way_to_say_separates_things is divides_objects. thing is substance. separated_thing is divided_thing. thing is object. change is when_one_thing_becomes_another_thing. thing is entity. everything is one_thing. burnt_thing is tangible_thing. matter is tangible_thing. change is thing.