The effect of air pressure on a can is pretty interesting. We saw a pop can getting immediately crushed by moving it from a hot surface to a bowl of icy water, as the air pressure was expanding when it was hot, and the cold condensation inside the pop can crushes it. The same thing was done with a 55 gallon drum, although it took longer.
Materials for hardboiled egg experiment:
paper
bottle
hardboiled egg
napkins/paper towel
matches
Prediction: Egg gets sucked into bottle, lands on flaming paper, and the classroom smells like burning eggs for the next week.
The egg did get sucked into the bottle! And it smelled terrible.
Why did it happen? Because the flame inside the bottle was expanding the air pressure through heat, and when it went out, the air was cooling, and that made the air contract. Which sucked in the egg.
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