How many drops of water can you fit onto a penny? Ten, Twenty, Thirty? Do you have a guess? Try this experiment at home in your kitchen. All you need is a dry coin, an eye dropper, and some water. Drop one bead of water at a time onto the middle of the penny slowly and build to as many as you can. Try different techniques and locations on the dry pennies. When you are done, go ahead and do a little research into cohesion and adhesion of water. For a twist, try rubbing a drop of dish soap (ahead of time) onto a penny and challenge a friend to match you drop for drop (they get the dish soap penny).
For more activities and fun with coins visit the U.S. mint website under educators:
http://www.usmint.gov/
~Dean Whitfield
Science and Math Department Chair
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