======Liquid Nitrogen Shrinking Balloon======


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**Alternative titles:** Liquid Nitrogen and a Balloon
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====Summary====                   
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====Procedure====  
  - Put on safety glasses and cryogenic gloves.  
  - Inflate a balloon and tie it securely.  
  - Using metal tongs, hold the balloon while carefully pouring liquid nitrogen over its surface.  
  - Observe as the balloon rapidly shrinks due to cooling.  
  - Hold the balloon up and allow excess nitrogen to drip off.  
  - As the balloon warms in the air, watch it expand back to its original size.  
  - Speed up the process by gently blowing warm air on the balloon.  



====Links==== 
Pressure Demo: Balloons in Liquid Nitrogen - Physics Demos: 
{{youtube>PdMtGyNEEv8?}}\\

📄 Liquid nitrogen + balloon - Fizzics Education: [[https://www.fizzicseducation.com.au/150-science-experiments/heat-experiments/liquid-nitrogen-balloon-2/?srsltid=AfmBOooC_Bl6G-_P6bHV3ByJD_uoLPUqYEnt-3BqvwbrqneoY1bxuxVJ]]\\



====Variations====
  * Use multiple balloons to create a before-and-after display for dramatic effect.




====Safety Precautions====
  * Safety glasses required.  
  * Wear cryogenic gloves when handling liquid nitrogen.  
  * Use metal tongs - never hold the balloon directly while pouring nitrogen.  
  * Perform in a well-ventilated area.  
  * Be cautious of the balloon popping if overstressed from temperature change.  
  * Never allow liquid nitrogen to become trapped inside the balloon.




====Questions to Consider====
  * Why does the balloon shrink when cooled by liquid nitrogen?  
  * How does Charles’s Law explain this phenomenon?  
  * Why does the balloon expand again as it warms up?  
  * Would helium-filled balloons behave differently from air-filled balloons? Why?  
  * How does this demonstration help us understand how gases behave in weather and everyday life?