Gravity-free Water

What you need:

• A glass of water filled right to the top

• A piece of cardboard

1. Put the cardboard over the mouth of the glass, making sure that no air bubbles enter the glass as you hold onto the cardboard

2. Turn the glass upside down (do this outside of over a sink!)

3. Take away your hand holding the cardboard

If all goes to plan then the cardboard and water should stay put. Even though the cup of water is upside down the water stays in place, defying gravity. With no air inside the glass, the air pressure from outside the glass is greater than the pressure of the water inside the glass. The extra air pressure manages to hold the cardboard in place, keeping you dry and the water inside the glass.