Everyone of us had noticed air bubbles once in his life. They are Sphere in shape. But I want to know why the are sphere in shape, instead of any other shape.
They are forced into a spherical shape by the pressure of water all around them, which is roughly equal on all sides, so the compressed air inside the bubble is forced into a shape which gives maximum volume for least surface area. However, bubbles are not always spherical, especially if they are very large bubbles. If you watch a wildlife programme on TV about marine or fresh water animals, you will see that the larger bubbles are often deformed by turbulence, and all bubbles gradually increase in size as they rise to the surface for the obvious reason that the nearer the surface the less the pressure.