We did this Egg in a Bottle Experiment a week ago when we had a couple friends over. The kids all thought it was pretty cool when the egg got sucked into the bottle (as you can see from the pictures below). I will be honest and let you know that we had a few issues at first getting the egg sucked in. I thought you could just lite a match and put it in the bottle and then the Air pressure would suck in the egg. WRONG a match does not produce enough fire for this to happen. So we finally used some paper and that worked great. If you like this experiment don’t forget to check out our other Science Experiments here.
What is happening with this experiment? Before the fire was put into the bottle, the pressure of the air inside the bottle was the same as outside the bottle. The fire then heats the air inside the bottle. This causes the air inside to expand. When you put the egg is on top of the bottle it then seals the bottle, and the fire goes out. When the fire goes out the air inside the bottle cools. As the air cools it contracts, and the pressure of the air inside the bottle becomes less than the pressure outside. Then, the higher outside pressure pushes the egg into the bottle.
Side Note: Don’t worry if you egg does not go into the bottle whole. We did this about 4 times and each time our eggs were torn while being sucked into the bottle.
1 hard boiled egg
1 glass bottle (we used a Snapple one, it has a wider opening)
2 pieces of paper