Simple Science Experiments

1. Simple Science Experiments:
Egg in a Bottle
BY STEVE DAVALA
Reading Time: 2 minutes
Sometimes you just have to force a hard boiled into a bottle, right? No? Well,
this simple demonstration will amaze and astound your friends by showing
how differences in air pressure can affect things.
Safety Warning: You will be using matches so make sure your parents are
helping out.
Materials:
 A glass container with a lid a bit smaller than an egg (I used a
Starbuck’s Iced Coffee bottle)
 a couple of peeled hard boiled eggs
 paper
 matches
Procedure:

2.  Empty, clean, and dry out your glass bottle. It is important that the bottle
lid is just small enough to stop a hard-boiled egg from going in it. Too small
and this won’t work as well
 Fold a small piece of paper (approximately 1” x 6”) in half
 Light the end of the paper and drop it into the bottle
 Make sure the fire is still going when you put the egg on top of the glass
bottle
 Observe!
Explanation:
Several things happen as soon as you put the egg on top of the bottle. You
should notice this jump up and down a bit. What is going on here?
Hot air expands, and so the hot air is pushing out of the bottle, but the egg is
in the way, forming a nice seal. To get out, the air makes the egg jump.
Next, the fire goes out when the oxygen is used up (oxygen is needed for
things to burn). When this happens, the air cools down again. It does the
opposite of expanding, and now it shrinks! As it shrinks, it forms low pressure,
or a “vacuum,” because now there is less air in the bottle than before you put
the egg on it. (Remember the air pushing out?)
Nature does not like a vacuum, so it tried to balance out the low pressure. As
a rule, high pressure goes to low pressure, and the egg just got in the way.
The high pressure pushes the egg into the bottle!
Now, how do you get the egg out? Depending on the bottle, the following trick
might work: Hold the bottle upside down and blow air into it past the egg. The
high pressure you push into the bottle will want to push out (much like a
balloon), and the egg will slowly push out. If that fails, just give it a few quick
shakes. Don’t expect the egg to stay in one piece, though!