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## Homework Statement

1)In a bubble the air molecules spread themselves out equally. However, outside where there is liquid, the pressure on the higher part is greater than below. So why would the bubble be perfectly round?

Also, would the pressure in the bubble be calculated via the hpg of the bubble as demonstrated in this image:

http://postimage.org/image/67myy06gl/full/ [Broken]

## Homework Equations

none

## The Attempt at a Solution

1)I am guessing that the air molecules in the bubble aren't spreaded out equally and on top the pressure exerted on the membrane of the bubble is greater than below. So this makes up for the higher pressure of water acting on the membrane on top than below. Hence the bubble is perfectly spherical. But still the air pressure cannot provide so much difference such that it should be equal right?

2) i think so because there is no formula for find the pressure of the air alone (usually when we use hpg, it would be of the fluid covering the whole system). But is it possible to find the pressure of the air bubble at point A by using hpg? If so how will it be done?

Thanks for the help!

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