Lots of tiny bubbles created when air gets mixed into a liquid, like the white bubbles on ocean waves or on top of coffee.
From Old English 'fam' and Old Norse 'fomi.' The word has remained nearly unchanged for over 1,000 years because the phenomenon it describes is unchanging—bubbles are universal.
Foam appears in chemistry, physics, and even economics—economists talk about 'foam' in markets when prices get bubbly. One simple word describes the structure of everything from beer to clouds to troubled economies.
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