Why the shape of bubbles are always round and they float in air. Why this happens and how

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Solution

They always hold the gas inside of them with the least possible surface area. The geometric form with the least surface area for any given volume is always a sphere

Since liquid "film" is very light, the air inside the bubble acts as if it's part of the air surrounding it,the bubbles have almost same density of that of air so they will float in air

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