# What Are Some First Grade Science Fair Projects?

There are many projects that you can easily do. But if you are looking for something that will be interesting and fun, try the following: (I have not tried this experiment before, so hopefully it works as I was told.)What you'll need:

A glass filled right to the top with water
A piece of cardboard

Instructions:

Put the cardboard over the mouth of the glass, making sure that no air bubbles enter the glass as you hold onto the cardboard.
Turn the glass upside down (over a sink or outside until you get good).
Take away your hand holding the cardboard.
What's happening?

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! So why is this happening? 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 your water where it should be, inside the glass.

Hope this helps.
thanked the writer.