The earth is round. The sun is round. The moon is round. This space is also round. Then why the balloon will not be round? Why would he be deprived of the glory of being a goal? But according to the wishes of the balloon, will the size of the balloon be right? Why isn't the balloon square, why isn't it like a pyramid?
Why does the balloon become round after inflating? Because of the elasticity of the balloon, the balloon holds round. Blowing puts pressure on the rubber cover of the balloon, it swells and at the same time applies pressure equal to and opposite to the pressure of the inside air.
The main advantage of elastic material is that it expands in such a way that it can hold a minimal surface area. The surface area of a round object is less than that of a square, pyramid or any other shape. So the balloon is round.
If more air is blown, the balloon swells in that proportion, maintaining a round shape. However, if the elasticity limit is exceeded, the balloon bursts.
Soap bubbles are round in shape for almost the same reason. The difference, however, is that soapy water is spherical due to its surface tension. When a piece of jute stick is dipped in soapy water and blown through the other end, the soapy water swells like a balloon under its pressure. The inside air creates pressure on the outside, while the soapy water puts equal pressure on the inside. This time the slightly sticky soapy water holds the minimum surface due to surface tension, which is round.
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