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Make your own fizzy geysers
6:59pm Wednesday 6th July 2011 in Backyard Science
The simple experiment, with interesting and sometimes messy results, can be done with simple items bought from any corner shop.
Vincent Holdsworth, science teacher at Immanuel College has shown us how to make fizzy geysers using some scotch mints and diet coke.
All you need to do is add one or two of the mints to the pop and observe.
Mr Holdsworth said: “The drink contains dissolved carbon dioxide which gives it the bubbles. The mints, although seemingly smooth, contain lots of tiny pits which act as a site for the carbon dioxide molecules to come together and form into a gas, known as a nucleation site.
“The gas quickly forms when the mints are added and the bottle can’t contain the huge volume of it, so it escapes out of the top, dragging the coke with it and forming a geyser.”
“Oh yes – and make sure you do this outside.”
l Visit telegraphand argus.co.uk/science for a video on how to do this experiment.