Ask students to suggest ways of getting the egg out of the bottle. Hold the bottle upside down with the small end of the egg in the bottle neck. Tilt the bottle down until there is a small opening between the neck of the bottle and the egg. Blow hard into the bottle making a closed seal with your mouth. Before you remove your mouth, tilt the bottle upside down.
Questions Answer the following questions in the spaces provided.
As the air was heated, it began to expand. Some of the air escaped causing the egg to wobble. When the flames went out, the air began to cool and contract. The egg sealed the bottle. Air pressure inside the bottle dropped below that of air outside the bottle.