======Foil Boat vs Foil Ball Buoyancy======


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**Alternative titles:** Aluminum Foil Buoyancy Demonstration
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====Summary====                   
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====Procedure====  
  - Tear two equal sheets of aluminum foil.  
  - Crumple one sheet tightly into a compact ball.  
  - Shape the other sheet into a shallow boat with raised edges.  
  - Fill a container with water.  
  - Place the foil ball and foil boat gently onto the water surface.  
  - Observe: the boat floats while the ball sinks.



====Links==== 
#SparkofScience: Buoyancy - The Franklin Institute: 
{{youtube>Lqmg08E-hQ4?}}\\


====Variations====
  * Hammer the ball into as dense a ball as possible.
  * Try different sizes of foil sheets to see how mass and volume affect floating.  
  * Add coins one by one into the foil boat to test how much weight it can carry before sinking.  
  * Compare with other materials shaped as boats (plastic wrap, paper).  
  * Explore how reshaping the foil ball into a flatter disk changes its buoyancy.



====Safety Precautions====
  *None provided.




====Questions to Consider====
  * Why does the boat float even though it has the same mass as the ball?  
  * How does water displacement explain buoyant force?  
  * What role does density play in floating and sinking?  
  * How is this principle applied in real boats and ships?