ksl219
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A small section of one of the airlocks on my home-brew cider which is bubbling in the kitchen - complete with a bit of spider web! Note how the curved front face of the bubble has progressed well beyond the lowest point of the airlock tube, but has been held back from breaking through and releasing the pent-up CO2 from the brewing process by surface tension.
The vertical extent of the image is 2".
Produced for submission in another place.
 Curves by John Liddle, on Flickr
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