On touch, not definitely coalesce; you've got to break the surface tension in the wall between them first. That's actually pretty hard to do, and in a universe without impurities it will be even harder. Most bubbles in our universe tend to simply bounce off each other.
(Soap bubbles are really bad for the intuition on this, because -- being film bubbles rather than bubbles in liquid -- they act quite differently. To begin with, they stick to each other and happily produce large flat regions of contact surface that are easy to break. Bubbles in liquid don't do that, unless they're physically pushed into each other.)
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zvi and
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Date: 2004-09-15 03:31 pm (UTC)(Soap bubbles are really bad for the intuition on this, because -- being film bubbles rather than bubbles in liquid -- they act quite differently. To begin with, they stick to each other and happily produce large flat regions of contact surface that are easy to break. Bubbles in liquid don't do that, unless they're physically pushed into each other.)