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bubble
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globule of one substance in another, usually gas in a liquid
~7 min read
Encyclopedic overview
Air bubbles rising from a scuba diver in water A soap bubble floating in the air
A bubble is a globule of a gas substance in a liquid. In the opposite case, a globule of a liquid in a gas, is called a drop. Due to the Marangoni effect, bubbles may remain intact when they reach the surface of the immersive substance.
Excerpted from Wikipedia’s “bubble” article, available under the CC BY-SA 4.0 licence.