Physics experiment: egg in the bottle
Learning physics depends on curiosity and interest, so experiments are so important. For starters, one of the most classic and easy: the egg in the bottle. A lot of people think it’s a trick, but the experiment is a practical example of how we are subject to atmospheric pressure.
The egg in the bottle is a very simple and classic experiment to study atmospheric pressure. You will need:
- A glass bottle with a large bottleneck
- A boiled, shelled egg
After cooking and peeling the egg, you will light a few matches and throw them inside the bottle. Then you will fit the egg into the neck of the bottle and wait for it to pull it in.
The open glass bottle is an open system, so when you throw a few matches part of the oxygen is consumed in the combustion and part of the air is heated. The air becomes less dense and tends to escape from the bottle. By placing the boiled and peeled egg on the top of the bottle, then the passage of air to the bottle is sealed.
As the air in the closed bottle cools down, the pressure decreases and thus generates an imbalance in relation to the atmospheric pressure, which becomes larger. To return to equilibrium it is necessary to enter air in the bottle, which is not possible because of the egg that is blocking the passage of air.
While the air in the bottle cools down, the pressure gets stronger and stronger, and as the boiled egg is flexible, there is a point where it can not stop the air from entering and then it is forced into the bottle, so the pressure in the bottle returns to equilibrium with atmospheric pressure.
Check out a video with the experiment step-by-step:
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