Hooked on Science: Water drops on a penny

Thursday, April 15, 2010

How many drops of water can you put on a penny?

Materials

* Penny

* Water

* Medicine dropper

Instructions

STEP 1: Using the medicine dropper, place drops of water on the penny.

Explanation

How many drops of water were you able to place on the penny? There are about 839 quintillion molecules in a drop of water. The molecules stick together, creating surface tension. You can break this surface tension by adding a drop of soap to the water on the penny.

Jason Lindsey is a Science Outreach Educator with Hooked on Science. Check out his website "Hooked On Science" at hookedonscience.org for webcasts and experiments that might get you hooked on science. Send him your science questions at jlindsey@hookedonscience.org. More science experiments can be found at www.semissourian.com.

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