Surface Tension on a Penny

See how many drops of water you can add to a penny!


  • penny
  • water dropper (or pipette or syringe)
  • water
  • dish soap


  • fill the water dropper with water
  • set the penny on a flat surface that can get wet
  • add one drop at a time to the penny and see how how much water you can add to the penny
  • try a variation where you touch some dish soap to the bubble of water on the penny.

Observation and Results:

  • What did you observe?
  • What do you think is happening?


The surface tension of the water allows you to build a stack of water on top of a penny.


surface tension penny 2surface tension on a penny 2surface tension on a penny

Please follow and like us:

Coco Science

Coco is interested in STEAM with a particular interest in the A. She has a hamster named Marshmallow and likes to read, craft, cook and dance.