Bubbles formed round-shaped ball, because the existence of a force of attraction is called surface tension, which pulls the water molecules as hard as possible, to form groups.
And grouping the strongest possible between the number of particles, is possible only if they form a ball. Among all the existing forms such as cubes, pyramids, and so on, just a ball or round shape which has an area outside the small side.
When you blow out the soapy water from a small pipe, the surface tension of water will find the smallest surface area. So then formed a ball.
Try to blow more air into the bubble soapy water before, then what happens is the soapy water will continue to expand its surface, to balance the pressure from within.
But the surface will be getting thinner, because the water supply is limited, so that at a certain point, the voltage was no longer able to withstand the air pressure from within and make it burst.
Then why do we have to use soapy water to form a bubble? Soapy water has special properties to reduce the surface tension of water. This cleaning agent made elastic enough surface tension of water to be withdrawn and can be stretched to form three-dimensional form.
Source: apakabardunia.com and several other sources.
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