Feb 2, 2007
Egg in a Bottle
Ever fancied squeezing an egg into a bottle? No? Well, it’s a kind of perennial physics demonstration that science teachers the world over love to do. I could simply describe how to do it and the results you might expect, but that would be no fun at all. Instead, I spent a good ten minutes scanning videos on the net where individuals attempted to carry out this experiment, some of them more successfully than others. Most handling naked flames and solvents (methylated spirits and the like) in a non-laboratory setting with absolutely no safety equipment (not even goggles) in sight.
More importantly though, most of these experimenters managed to get most of the egg in the bottle, but usually the egg split and simply splurted into the bottle rather than squeezing through the neck and plopping into the bottle intact.
In this video, the “researchers” succeeded in getting a nice squeeze and plop (far better even than the Brainiac team in their attempt).
The key to their success is apparently using a bottle with a nice wide neck. Most of the other videos try to use a beer bottle or something similar which constricts the egg as it squeezes through the opening and splits it.
So, how does it work? What mysterious force is pulling the egg into the bottle? Well, the answer is there is no mystery it is simply air pressure pushing down on the egg. But, wait a minute, what’s the burning paper got to do with air pressure?
Okay, here’s the short of it. Dropping a burning spill (or burning piece of paper into a bottle) and the air in the bottle will quickly expand and a small volume escapes. When the hard-boiled egg (with the shell removed) is placed into the opening, the spill goes out, the remaining gas cools and contracts and the greater outside air pressure pushes the moist flexible egg into the hole nicely.
If you use a nice moist egg and a bottle with a wide enough neck you’ll get a nice squeeze and plop. Anyone who has a use for a hard-boiled egg covered in burnt paper stuck in a bottle is welcome to contact us at Sciencebase with their ideas. Additionally, if you know how to get the egg out again without breaking the bottle leave us you thoughts in the comment form.
"Deceived Wisdom: Why What You Thought Was Right Is Wrong" from David Bradley. Available now on 
Interesting solution Kyler, but like you say you run the risk of getting a sooty hard-boiled egg shoved down your throat in the process, I’d want a safer way of getting the egg out than that, to be honest.
db
Getting the egg out of the bottle is just as easy, if not easier than getting it in. You simply just have to tip it upside down, put your mouth around the end of the bottle so you create a seal, and blow up into the bottle, just be careful because the egg will shoot out of the bottle and if you arent careful, it will shoot down your throat. Only do this if you dont mind potentially getting some ash in your mouth..its gross..but it will work everytime.
“Spill” is another word for a splinter. Usually, in such an experiment one would use a thin piece of light wood that would be lit and dropped into the bottle.
db
Where do u put the burning paper?How does it spill?What is the material u need to make it spill?
well … it ok, 4 science!!!