======Balloon in Syringe Boyle's Law======


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**Alternative titles:** In and Out: Demonstrating Boyle’s Law
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====Summary====                   
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====Procedure====  
  - Fill one small balloon with air, keeping it small enough to fit inside a syringe, then tie it off.  
  - Fill another balloon with water to match the size of the air-filled balloon and tie it off.  
  - Place the air-filled balloon into the syringe and insert the plunger.  
  - With the syringe tip open, push the plunger and observe how air escapes.  
  - Seal the syringe tip with a finger and push the plunger again, noting how the balloon contracts as pressure increases.  
  - Pull the plunger back with the tip sealed and observe the balloon expanding as pressure decreases.  
  - Repeat the procedure with the water-filled balloon to show that liquids do not compress like gases.  
  - Optionally, add water inside the syringe with the air-filled balloon to see how liquid limits the plunger’s movement while still affecting the air volume.



====Links==== 
Boyle's Law Experiment - Balloon Test - Science Projects for Kids - MocomiKids: 
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Fun with Boyle's Law | English | Air Water Compression - Arvind Gupta: 
{{youtube>jJTolLG7GAI?}}\\

📄 In and Out: Demonstrating Boyle’s Law - Science Buddies: [[https://www.scientificamerican.com/article/in-and-out-demonstrating-boyles-law/]]\\

====Variations====
  * Compare balloons filled with different gases (air vs. carbon dioxide from a soda).  
  * Try different syringe sizes to see how compression changes.  
  * Use warm and cold balloons to investigate whether temperature affects expansion and contraction.



====Safety Precautions====
  * Be careful when using scissors to cut balloons.  
  * Ensure the syringe has no sharp needle attached.  
  * Do not overfill balloons, as they may burst when compressed.




====Questions to Consider====
  * What happens to the air-filled balloon when you push the plunger with the tip sealed? (It contracts because pressure increases, reducing volume.)  
  * What happens when you pull the plunger back with the tip sealed? (It expands because pressure decreases, increasing volume.)  
  * Why does the water-filled balloon not change shape? (Liquids are nearly incompressible, unlike gases.)  
  * How does this demonstration connect to how we breathe? (Expanding the chest cavity lowers pressure, drawing air in; contracting raises pressure, pushing air out.)