0
$\begingroup$

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.

$\endgroup$
  • 2
    $\begingroup$ Think about : largest volume for the enclosing material... also pressure is equal in all directions... $\endgroup$ – user207455 Jul 14 '19 at 18:03
  • 4
    $\begingroup$ Possible duplicate of Why sphere minimizes surface area for a given volume? $\endgroup$ – BioPhysicist Jul 14 '19 at 18:08
  • $\begingroup$ why does volume matter? Soap bubbles aren't filled with soap. $\endgroup$ – JEB Jul 14 '19 at 20:25
  • $\begingroup$ @JEB did the OP mention soap? $\endgroup$ – user207455 Jul 14 '19 at 21:17
  • 2
    $\begingroup$ The "small" bubbles are spherical. Larger bubbles rising through a water column are definitely NOT spherical. $\endgroup$ – David White Jul 15 '19 at 1:05
3
$\begingroup$

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.

$\endgroup$
2
$\begingroup$

Surface tension. Ps they can be deformed a bit by drag forces when rising up through a liquid.

$\endgroup$
  • 2
    $\begingroup$ I think you should ellaborate this answer a little more $\endgroup$ – FGSUZ Jul 14 '19 at 22:05

Not the answer you're looking for? Browse other questions tagged or ask your own question.