TITLE: Air bubble trapped inside water at the spout of water tap
QUESTION [1 upvotes]: Is there a name for this effect and how is it formed?

REPLY [0 votes]: This phenomenon is generally referred to as nucleation of a bubble, for various types of bubbles, whether in an opened can of soda, plashing of water or at the tap. The reason why such bubbles for is a topic of research and uses concepts from fluid mechanics including surface tension.
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