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HOW IS A BUBBLE FORMED?
Bubbles always form into a spherical shape when they're inflating. It is surface tension. Example: Soap bubbles. When they are initially formed, bubbles have very low surface tension, because of the distribution of the soap molecules. As the bubble grows, the soap molecules are distributed more widely across the surface, increasing the surface tension. Because of the need to keep surface tension low, the bubble must form into a shape that has low surface area. Spheres utilize the lowest possible surface area to enclose a given volume, therefore they put the least amount of strain on the soap molecules. This allows the bubble to grow larger without bursting.


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