How many drops of water can you fit on a penny?
A quarter?
Is there a way to fit more?
You need to add one drop at a time, either by using a dropper or by dripping them off the tip of your finger. Add each one slowly.
Extension: What happens if you add dish soap to the water and repeat the activity? If you cover the coin in sunscreen first?
Key concepts:
Surface tension: the molecules stick together and hold their shape. You can see this when you look at raindrops on leaves or flower petals, for example. Mixing other liquids into the water changes the surface tension.
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