2. What we will need: bottle with a cap, thin glass tube,
Bunsen burner, gloves, bowl with colored water.
What we do:
• Pour some water in the
bottle
• Heat the bottle until the
water begins to boil.
• Close the bottle and
quickly turn it upside
down into the bowl of
colored water.

3. Explanation
• The steam that pushed the air out of the bottle is now
getting cooled and the pressure drops.
• The pressure in the bottle is less than the atmospheric.
• Therefore, the water is pushed by the outside air and
you can see the water rising the thin glass tube forming
a fountain.