This egg-in-a-bottle experiment is all about air pressure and temperature changes and looks SUPER cool- Let’s see what happens step by step!
When you light the piece of paper on fire and drop it inside the bottle, the air inside the bottle starts to warm up. As the air gets hotter, it expands and some of it escapes out of the bottle around the edges of the egg.
Next, you quickly (and carefully) put the egg on top of the bottle. This part is important because it seals the opening, not letting any more air escape or enter the bottle.
After a little bit, the fire goes out because it uses up the oxygen inside the bottle. After the fire goes out, the air inside the bottle starts to cool down. Here’s where it starts to get fun: Cooler air takes up less space than hot air, so the pressure inside the bottle drops.
Now, here’s the cool part! The air pressure outside the bottle is greater than the air pressure inside the bottle. This difference in pressure causes the egg to be pushed into the bottle! It might look like the egg is being “sucked” in, but it’s really the higher air pressure outside pushing the egg INTO the bottle.
Summed up: this experiment shows how changes in temperature and air pressure can create a force strong enough to push an egg into a bottle!