Trap Water with Holes

You can keep water inside a glass by covering the top of the glass with a piece of cardboard full of holes!

To trap water with holes you need:

  • a glass
  • water
  • thin cardboard
  • thumbtack or small sharp nail


  1. Poke lots of holes into the cardboard with a thumbtack or nail.
  2. Fill the glass with water until it is over-flowing.
  3. Press the cardboard over the top of the glass until water squishes through the holes.
  4. While still pressing the cardboard over the top of the glass, turn the glass upside down.
  5. Take away your hand. The cardboard sticks to the mouth of the glass and the water doesn’t drip through the holes.

Learn more…

  • Fun Science Activities for Kids – used with permission