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The bottled egg
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      Glass flask. 
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     1. Boil an egg for fifteen minutes. (it is essential that the egg is very well cooked)

     2. Drop three or four lighted matches inside the glass flask.

     3. Place the peeled egg in the flask mouth. (the flask mouth should sustain the egg. However, this should have a similar diameter to the egg largest diameter)

     4. Observe what happens. Have you bottled the egg?

As well as the balloon of the experiment Sucked Balloon, the egg is sucked inside the bottle. However, in this experiment we use matches instead of hot water. When the lighted matches are in the flask they heat the air inside it. As we know, hot gases occupy larger volume than cold. After heating, when the gas cools down it contracts and, therefore, it occupies less volume. When we place the egg in the flask mouth we have a closed system. In other words, when the gas inside the bottle begins coolling (air compressing), the pressure inside the flask will get lower. In that instant, the egg will be forced to enter inside the flask to reduce the pressure difference between outside (atmospheric pressure) and inside (less than atmospheric pressure). In other words, the egg will be forced to occupy the space left by the gas that contracts as the temperature decreases. Now you know how to bottle a hard egg! Try it and enjoy!

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