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======Dry Ice Singing Spoon======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
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**Alternative titles:** Singing Spoon
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====Summary====                   
{{$demo.summary}}


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====Procedure====  
  - Place a block or chunk of dry ice on a safe, insulated surface.  
  - Hold a metal spoon (or other smooth metal object) by the handle.  
  - Firmly press the spoon against the dry ice surface.  
  - Listen for the high-pitched squealing or singing sound as the metal vibrates.


====Links==== 
Singing Spoon Easy Dry Ice Project - Anne Helmenstine:
{{youtube>NuVxT6UPLBQ?}}\\
📄 Science Notes: [[https://sciencenotes.org/singing-spoon-dry-ice-experiment/]]

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====Variations====
  * Use different metal objects such as forks, coins, or tongs to compare the pitch and tone.  
  * Experiment with pressing harder or lighter to change the loudness and frequency.  
  * Place the spoon flat versus on its edge to observe differences.


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====Safety Precautions====
  * Wear insulated gloves or use tongs when handling dry ice to prevent frostbite.  
  * Do not place dry ice directly on bare skin or in your mouth.  
  * Conduct the experiment in a well-ventilated area to avoid buildup of carbon dioxide gas.  
  * Keep dry ice away from sealed containers, as pressure buildup may cause an explosion.
  * Students must not remove dry ice from the demonstration area.


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====Questions to Consider====
  * Why does the spoon make noise when pressed against dry ice?  
  * How does the sound change with different shapes or sizes of metal objects?  
  * What role does sublimation of dry ice play in this demonstration?


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