chemically

Digestion is breaking food into smaller bits, either mechanically — like by chewing — or chemically, like with the enzymes in my saliva and stomach.

Mineral water must come from a certified underground spring, it must not be chemically treated in any way, and is generally under heavy regulation.

So microwaves heat food molecules mechanically, through friction— but they don't alter them chemically.

All of these are quite different scents but one thing they have in common, chemically speaking, is that they contain terpenoid compounds — organic molecules made from links of a 5-carbon structure called isoprene.