We’ve made eggs bounce before, and now it’s time to make an egg move by itself into a bottle. It doesn’t look possible, but it is.
And while our egg ended up in multiple pieces (hey they all went into the bottle!), we still had fun doing the experiment and learned something in the process.
Let’s get started!
Egg in a Bottle Science Experiment Video
- Hard-Boiled Egg (shell removed)
- Glass Bottle
- Thick Piece of Paper
- Match or Lighter
Safety Note: Because the experiment involves fire, adult supervision is required. Please take the appropriated measures to ensure everyone stays safe.
Step 1 – Position the egg near the empty bottle. This is needed because you have to move fast once it is time to place the egg on the bottle.
Step 2 – Take a strip of thick paper. Thick paper is important because you need something that won’t burn too quickly when you light it on fire during the next step.
Helpful Tip: I used a piece of index card. Construction paper would also work nicely.
Step 3 – Light the piece of paper and drop it into the bottle.
Safety Note: Remember to always use safety measures when dealing with fire.
Step 4 – Once the paper is burning, carefully but quickly drop it into the glass bottle.
Step 5 – Immediately after you put the paper in the bottle, place the egg on the top of the bottle.
Step 6 – Watch as the egg begins to slowly move into the bottle.
Helpful Tip: If you are lucky the egg will stay in one piece as it moves into the bottle. Or if you are like us, the egg will eventually split as it is squeezed into the mouth of the bottle. Watch the Egg in a Bottle Experiment Video to see what happens to our egg.
How Does the Experiment Work?
Air has mass, so it has other properties like pressure and density. Air is able to push or crush objects when given the opportunity. We don’t often see air pushing or crushing objects because air molecules surrounding objects push on objects equally in all directions. In this experiment, you get to see the power of air! Air pressure is the reason the egg moves into the bottle without us touching the egg. Let’s go over exactly what happened.
When we started the experiment, the air pressure inside the bottle was the same as the air pressure outside of the bottle because the air inside the bottle and outside the bottle was the same temperature. After we placed the burning paper in the bottle, the air inside the bottle began to heat up and expand. A few seconds after we placed the egg on top of the bottle, the fire went out and the paper stopped burning. This caused the air inside the bottle to cool down and contract. When the air contracts, the air pressure inside the bottle becomes less than the air pressure outside the bottle. This gives the higher air pressure outside of the bottle the opportunity to push the egg down into the bottle.
I hope you enjoyed the experiment. Here are some printable instructions: