======Egg in a Bottle======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Alternative titles:** Air Pressure Egg Trick, The Egg Squeeze Experiment
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====Summary====                   
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====Procedure====  
  - Hard boil a medium-sized egg and peel it.  
  - (Optional) Grease the bottle’s neck with a little vegetable oil.  
  - Place the egg on the bottle’s neck to show that it cannot fit inside without force.  
  - Light 3 matches and drop them into the bottle.  
  - Quickly set the egg over the bottle’s mouth.  
  - Watch as the egg is pushed into the bottle by outside air pressure.  
  - To remove the egg, turn the bottle upside down and blow into it. The air pressure increases, pushing the egg back out.



====Links==== 
What is Air Pressure: Egg Demonstration - funsciencedemos: 
{{youtube>TKMKKOV7xhM?}}\\


📄 Egg in a Bottle - Science World: [[https://www.scienceworld.ca/resource/egg-bottle/]]\\



====Variations====
  * Use a small water balloon instead of the egg.
  * Replace matches with a rolled paper towel “wick” lit on fire and dropped in.
  * Perform the experiment upside down by attaching candles to the egg, lighting them, and placing the bottle over it to suck the egg upward.



====Safety Precautions====
  * Adult supervision required when using fire.  
  * Handle matches and flames carefully to prevent burns.  
  * Do not use glass bottles with thin walls (risk of breaking when heated).




====Questions to Consider====
  * How can we get the egg into the bottle without chopping it up? (By changing air pressure inside the bottle so outside air pushes it in.)  
  * Why is an egg suitable for this experiment? Could we use a ping-pong ball or a golf ball? (The egg is soft and flexible, so it can deform slightly to fit through the opening. A hard ball cannot compress to fit.)  
  * Does the egg get “sucked” into the bottle? Why or why not? (No, it is pushed in by higher outside air pressure.)  
  * How else could you change the pressure of the air inside the bottle? (By heating the air with hot water, or cooling it rapidly.)  
  * How will we get the egg out? How do we increase the pressure inside the bottle? (By blowing into the bottle to raise inside pressure, forcing the egg back out.)