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======Floating Coin on Water======


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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:** Floating Aluminium Coins
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Fill a clean bowl or beaker with water.
  - Add a drop of food coloring to the water to make the water surface more visible.
  - Gently set an aluminum coin (such as a yen or old French franc) on on the surface with a tissue or fork.
  - Observe the curvature of the water surface around the coin from the side view.


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====Links==== 
Floating Coins Experiment - Taras Kul: 
{{youtube>ON-aHTx-xXI?}}\\
How to float coins on water - Suhani Sharma: 
{{youtube>lZcm5w-a9Bs?}}\\
📄 Floating Coins - University of Waterloo: [[https://uwaterloo.ca/chem13-news-magazine/september-2013/feature/floating-coins]]\\


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/* VARIATIONS - Optional                                                                               */
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====Variations====
  * Try floating coins made of different metals to test how density and thickness affect floating.
  * Use other small lightweight objects, such as paper clips or needles, to demonstrate surface tension.
  * Measure the maximum size or weight of coin that can still float on water.
  * Repeat the experiment with liquids other than water (such as ethanol or saltwater) to compare surface tension.


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====Safety Precautions====
  * No hazardous chemicals are used, but spills should be cleaned immediately to avoid slippery surfaces.
  * Handle coins carefully to avoid dropping them into glassware, which may crack or break.


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====Questions to Consider====
  * Why can aluminum coins float on water even though their density is greater than that of water?
  * How does surface tension differ between water and other liquids?
  * What might happen if soap is added to the water? Why?


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/* Complete information in the Demonstration Info box below, following instructions exactly. */