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S tarting here in the Latin world, a bubble is originally a bulla, that is, a ball; a metallic ball, first, attached to a seal, and by continuity the papal decree stamped with this seal; or a bulla, blown by children from a soapy water, or observed inside a sparkling liquid. Nowadays, bolla designates in Italian both the bubble inside a liquid and the papal seal -in French, we similarly have bulle for both meanings, as in Spanish with bula (where bubbles in liquids are however most oftendoi:10.1051/epn:2006406 fatcat:oz46nji7rvawli34yngclzk4s4