What You Need
- an egg
- a glass of vinegar
What To Do
Just put your egg in the glass of vinegar (so it's completely covered) at leave it to soak for a few days.
The Science Bit...
The egg shell is made of a material called a carbonate. When a carbonate reacts with an acid (the vinegar), it is converted into carbon dioxide. So in this experiment the vinegar is causing the carbonate in the egg shell to turn into carbon dioxide.