Put the egg in a pot full of water. Use warm water so it will boil faster. Boil the water by putting the pot on the stove set to Medium-High temperature. Let it sit there for 20 minutes while the water boils. Empty the boiling water into the sink being careful not to burn yourself. Use cold water to cool the egg, then peel the shell off. It can be helpful to tap the egg on the counter to crack the shell so that it is easier to peel. [2] X Research source
Make sure that you use a glass bottle. Using a plastic bottle (or a bottle made of any material other than glass) could be very dangerous. The mouth of the bottle should be small, but still at least half the diameter of the egg (like a milk bottle).
Put the egg in a pot full of water. Use warm water so it will boil faster. Boil the water by putting the pot on the stove set to Medium-High temperature. Let it sit there for 20 minutes while the water boils. Empty the boiling water into the sink being careful not to burn yourself. Use cold water to cool the egg, then peel the shell off. It can be helpful to tap the egg on the counter to crack the shell so that it is easier to peel. [5] X Research source
Once the egg seals the top of the bottle, the matches quickly run out of oxygen and go out. As the air in the bottle cools, the volume of air inside the bottle drops due to condensation of the water vapor (look for the little “cloud” inside the bottle just as the match goes out) and the cooling of dry air. When the volume of the air drops, it exerts less pressure on the egg, while the air pressure outside of the bottle doesn’t change. The egg is pushed into the bottle once the difference between those forces is sufficient to deform the egg and overcome friction with the neck of the bottle.
