EQUIPMENTS:
1. A transparent bottle containing an
egg inside it.
2. Vegetable oil or any other kind of
oil
3. Your breath
INSTRUCTIONS:
1. At first apply the vegetable oil on the mouth of
the bottle so that the egg can come out a little bit easier.
2. Turn the transparent bottle containing the egg
inside it upside down so that the egg is on the inner mouth of the bottle. It
should be also alright if you just tilt the bottle a bit. You can try it in
both ways.
3. Now position the mouth of the upside down or
tilted bottle just right over your mouth.
4. Now blow as hard as you can inside the bottle on
the egg.
5. Observe what happens.
RESULT:
When you blow hard inside the bottle on the egg, the
egg should slide out of the bottle very quickly. Careful not to let the egg hit
your face.
EXPLANATION:
The air pressure inside the bottle and
outside the bottle is the same. The trick is to make the air pressure in the
bottle greater than the air pressure outside the bottle. When you blow hard in
the bottle with your breath actually a fast moving air enters the bottle. This
changes the balance of the air pressure inside and outside of the bottle. Fast
moving air exerts less pressure than the still air. That’s why when we blow on
the egg inside the bottle the air pressure outside the bottle reduces but the
air pressure inside the bottle is the same because it is still. So the air
pressure inside the bottle becomes greater than the air pressure outside the
bottle. That’s why the egg comes out the bottle. The vegetable oil used on the
mouth also helps the egg to slide out a little more easily.
MORE
EXPLANATION:
This experiment is based on Bernoulli’s principle.
This principle states that – as the speed of the air is increased, the pressure
which it exerts decreases. This principle of Bernoulli is used in various ways
today such as designing airplanes, helicopters and other kinds of flying
objects.
MORE EXPERIMENTS FOR YOU :
1. Use a pumper instead of your own
breath.
2. See
what will happen if you put hot water inside the bottle containing the egg.
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