======Uncrushable Egg======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Impossible Egg Crush
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====Summary====                   
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====Procedure====  
  - Place a raw egg in the palm of your hand.  
  - Wrap your fingers completely around the egg.  
  - Hold the egg over a sink or bowl and squeeze by applying even pressure all around. Notice that the egg does not break.  
  - Next, hold the egg between your thumb and forefinger and squeeze at the top and bottom. Observe the outcome.  
  - Place the egg in your palm again and press firmly on only one side of the shell without squeezing evenly. Record what happens.  
  - Try squeezing the egg again while wearing a ring on one finger of the squeezing hand. Compare the results to the previous trials.



====Links==== 
Wonder Zone: Impossible Egg Crush - Cincinnati Museum Center: 
{{youtube>VUEHkqyd_JE?}}\\

Breaking An Egg With One Hand Experiment | Impossible Egg Crush Experiment | Egg Experiment For Kids - Playing With Rain: 
{{youtube>cMSLjVLoFrk?}}\\

📄 Impossible Egg Crush - Steve Spangler: [[https://stevespangler.com/experiments/impossible-egg-crush/]]\\


====Variations====
  * Compare fresh eggs with older eggs to see if the shell strength changes.  
  * Try the experiment with boiled eggs to compare shell strength when the contents are solid.  
  * Test different bird eggs (e.g., chicken, quail, duck) for strength differences.



====Safety Precautions====
  * Use a gardening glove to avoid potential cuts.
  * Perform the experiment over a sink, bowl, or plate to catch spills.  
  * Wash hands thoroughly after handling raw eggs to prevent salmonella risk.  
  * Avoid eating eggs that have cracked during the demonstration.  
  * Use adult supervision if young children are conducting the experiment.




====Questions to Consider====
  * Why does the egg resist breaking when squeezed evenly? (The curved shell distributes the pressure evenly, acting like an arch.)  
  * Why does the egg crack when pressed on one side? (Uneven force concentrates stress at one point, breaking the shell.)  
  * How does this relate to how hens sit on their eggs without breaking them? (The hen’s weight is spread evenly, but a chick pecks at one spot with uneven force.)  
  * What does this experiment show about the strength of natural structures? (It demonstrates how nature uses shapes like arches for strength and efficiency.)