What you need:
- Hanky or thin piece of fabric
1. Place hanky loosely over the top of the glass. Pour the water
in the glass through the hanky - you can see the hanky isn't
2. Take the hanky out of the glass and fill the glass up with
3. Stretch the hanky tightly over the glass - don't leave any
4. Hold on tight to the hanky and turn the glass upside down.
What happens to the water?
When you turn the glass upside down, the water should stay in
the glass. For this to work, make sure you're stretching the hanky
very tightly over the glass. I used a pillowcase, which is a little
bit harder to hold onto. For the best results, use a piece of
material around the same size as a hanky - it's easier to stretch
tightly over the glass.
I held my camera underneath the glass and didn't get any water
What's going on?
For water to spill out of the glass, something needs to take its
place - in this case, air. When you pull the hanky tightly across
the glass, you make an airtight seal. No air can get in, so no
water can get out.
Try holding the glass over a friend's head - be careful not to
drop it! - and see if they believe the water will stay in the