Water in Upside Down Glass

Can you keep the water from dropping? Let’s make an experiment using simple household materials and try to defy gravity and hold the water in place in an upside down glass and understand the science behind it.

Required Materials

  • Empty Glass
  • sheet Cardboard (that covers the mouth of glass)
  • Water

What To Do

  1. Fill the glass with water up to top level.
  2. Take a flat sheet of cardboard and place it over the mouth of the glass.
  3. Hold the cardboard with mouth of glass tightly and quickly upside down the glass.
  4. Slowly take away your hand that is holding the cardboard.

If all goes correct than cardboard will stick to the mouth of glass and no water will drop from it.

upside down glass


So you’re thinking what is happening here! Actually there is no air inside the glass so pressure of outside air is much greater than inside of glass which is able to hold the cardboard in place which in turn keeps the water from dropping.


  1. Try to use different kinds of paper sheets and use it in the place of cardboard to hold the water. Observe which paper sheet is able to hold the water.

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