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We are working with surface tension and bubbles. What causes the surfaces of bubbles to become flat, when they come into contact with each other?

The bubble surfaces are curved because the pressure inside is greater than the pressure outside. Where two bubbles touch, the pressure on both sides is the same. So there is no pressure difference to cause a bulge, and the surface is flat. If the two bubbles are different size, their pressures are different. What do you suppose happens to the surface where they touch?

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