the.com/froth

The foam that convinces you a drink is fancier than it is.

means A light layer of fine bubbles on a liquid — or, figuratively, excitement or talk that's showy but insubstantial.

from From Old Norse 'frotha' or 'fritha,' meaning foam — a word English borrowed during the long linguistic cross-pollination of the Viking Age. It settled into Middle English as 'frothe' and has meant bubbly, airy stuff ever since, both the kind on your cappuccino and the kind in overheated speeches.

physics
trapped gas bubbles stabilized by proteins or fats
coffee tell
microfoam means skill, big bubbles mean rushed
beer rule
thick head traps aroma, flat beer tastes duller
etymology
old norse fraud meant spray, not deception
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