1. Fill a bowl
with some cold water.
What happens to the coin?
2. Place the bottle (neck) and
coin in the bowl of water to chill
them. This helps to make an
airtight seal when you place the coin
on the top of the bottle. You can use a plastic bottle.
3. Stand the bottle up right and place the coin on the top
of the bottle (mouth).
4. Wrap your hands around the
bottle and wait for several seconds.
5. Remove your
hands from the bottle and wait.
What happens to the coin now?
Why does the
When you hold the bottle
with your hands, the air inside the
bottle heats up.
The warm air pushes
harder than the cool air that is outside
the bottle so it forces the coin up.
When the air inside
the bottle cools down the coin will