Egg in a Bottle


Objective

Learn how to use differences in pressure to do what seems impossible: fit an egg through the mouth of a glass bottle!

Supplies

  • 1 hard boiled egg
  • 1 glass bottle  (Mouth should be just slightly smaller than the egg. A Snapple bottle works great!)
  • 1 small piece of paper
  • 1 match

Procedures

  1. Remove the shell from the egg.
  2. Fold the piece of paper into a strip.

  3. Light the match and ignite the folded strip of paper.

  4. Drop the burning strip of paper into the bottle.

  5. While the paper is still burning, set the egg back onto the mouth of the bottle. (Be careful to make sure there aren’t any gaps between the egg and the mouth of the bottle. If the egg does not sit well on the mouth, or if there are any cracks or chips in either the bottle or the egg, the experiment will not work.)

  6. Watch the egg get sucked inside the bottle!

Watch out!

This experiment requires flame. Safety precautions should be taken to tie back long hair, restrain any loose clothing, and keep a fire extinguisher on hand. This experiment should only be performed with adult supervision.

Take-away

This experiment works based on a difference in pressure inside and outside the bottle. When you burn the paper, the air inside the bottle heats up. The molecules of air begin to move faster and move away from one another. Some of them escape outside the bottle. Since there are less air molecules inside the bottle, a vacuum pressure is created inside the bottle. This vacuum sucks the soft egg inside the bottle to balance the pressure inside and outside the bottle.