Bring an egg outside the bottle

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.

Egg in a bottle!

EQUIPMENTS:

1. A hard-boiled egg

2. A transparent bottle which has little bit smaller mouth than the width of the egg.

3. Some hot water

INSTRUCTIONS:

1. Peel the hard-boiled egg and place it on the mouth of the bottle. Make sure that the egg doesn’t fall off the mouth of the bottle.

2. After making sure of that, take away the hard-boiled egg from the mouth of the bottle.

3. Now heat up some water and fill the bottle with it. Heat up enough water to fill one fifth or one fourth of the bottle.

4. Make sure that the water is not too much hot. Otherwise if the bottle is made of glass then it will crack or break and if the bottle is made of plastic its shape will change which will not be very good for the experiment.

5. Now put the hard-boiled egg again on the mouth of the bottle.

6. Waite until the water inside the bottle gets completely cold. It would be best if you put the bottle in a bowl full of cold water so that the water inside the bottle gets cold quickly.

RESULT:

1. When the water inside the bottle is hot the hard-boiled egg might jump or vibrate a little.

2. After the water gets cold the egg should get sucked into the bottle slowly.

EXPLANATION:

Egg in a bottle!

When the egg was first placed on the mouth of the bottle before we put the hot water inside the bottle, the air pressure inside the bottle is the same as the air pressure outside the bottle. Nothing is different about these two air pressures. When hot water is put inside the bottle, it makes the air pressure inside the bottle greater than outside the bottle. This is due to the fact that heat expands matter which includes even air. So because of the hot water, the air inside the bottle expands making the air pressure inside greater than the air pressure outside the bottle. Because of the greater air pressure inside the bottle, the hard-boiled egg placed on top of the bottle might jump or vibrate a little bit. But when the water inside the bottle cools down the air inside the bottle also cools down and contracts. This makes the air pressure inside the bottle lesser than the air pressure outside the bottle. So the greater air pressure outside the bottle pushes the hard-boiled egg placed on top of the bottle and eventually the hard-boiled egg gets inside the bottle.

MORE EXPERIMENTS FOR YOU:

1. Try using a burning matchstick instead of hot water.

2. Try using different kinds of eggs to see if that makes any difference in the experiment.

3. You can put your finger on the hard-boiled egg placed on the mouth of the bottle to feel with how much pressure the hard-boiled is being pushed.