Egg in bottle
This trick demands an egg, vinegar and a bottle or jar with opening slightly smaller than the diameter of the egg. See the video for instructions!
The shell dissolving is an acid-base reaction. Calcium carbonate reacts with the acid in the vinegar to make carbon dioxide. Reaction might take up to three days, so be patient.
Getting the egg into a bottle depends on air pressure. If you have a constant volume of gas, the pressure increases when you heat it. If you cool the air, the pressure decreases. When the flames run out the air inside the bottle cools down and the pressure inside it decreases. As the egg seals the mouth of the bottle, the pressure of air outside the bottle forces the egg into the bottle.
Now the only problem left is to get the egg out of bottle without ruining it. Does anyone have any ideas on how to do that?
Veli-Matti Vesterinen is the co-founder of MyScience. In addition to science, Veli-Matti loves cycling, snorkeling and playing ukulele.