Do Bubbles Pop from the Top or the Bottom
A soap bubble
consists of a thin layer of water trapped between two layers of soap
molecules. The liquid layer is thin, but it is still affected by
gravity, so as a bubble floats, the water is drawn to its base. The film
at the top of the bubble thins, even as evaporation removes liquid from
the entire surface, until finally the bubble pops -- from the top. If
you freeze bubbles
with dry ice, you can pick a bubble up to examine it more closely to
verify this for yourself. Another fun way to view bubbles is to color them.
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