Try this Physics Central feature to see an activity that illustrates the Raleigh-Taylor instability--the creation of ripples at the surface between two fluids with the higher-density fluid on top. The ripples become growing fingers, and the fluids mix. You can do this activity with easily obtainable materials, chilled tap water and hot, dyed tap water.
%0 Electronic Source %D January 5, 2001 %T My Cup Runneth Down %V 2013 %N 5 December 2013 %8 January 5, 2001 %9 text/html %U http://www.physicscentral.com/explore/pictures/cup.cfm
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