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If the interface between a gas and a liquid oscillates back and forth, if the amplitude of oscillation is low, then the interface motion is synchronous with that of the driver and the body of the liquid. However if the oscillatory acceleration of the interface exceeds a certain value, then surface waves are set up on the interface. This was first demonstrated by Faraday in the 19th Century, when a plate of water was oscillated up and down on a plank of wood 18 feet long. That experiment is reconstructed here, showing TG Leighton and a technician (and a technician (D. Theobald). (Video: PR Birkin, TG Leighton). Such waves can also be excited on the wall of a bubble: Click here to see a movie of this.



This page was last updated by TG Leighton, 6 August 2004