======Freeze Antifreeze with Liquid Nitrogen======


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**Alternative titles:** Freezing Antifreeze
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====Summary====                   
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====Procedure====  
  - Place a small sample of antifreeze in a cryogenic-safe container e.g. metal.  
  - Wearing cryogenic gloves and safety glasses, carefully immerse the container into liquid nitrogen.  
  - Observe whether the antifreeze freezes, thickens, or changes appearance.  
  - Compare this with a sample of plain water exposed to liquid nitrogen under the same conditions.  
  - Remove the antifreeze after a short time and observe how it behaves as it warms.



====Links==== 
Is It Possible To Freeze Anti-Freeze? TKOR Finds Out What Antifreeze Does In Liquid Nitrogen - TKOR: 
{{youtube>RSBELBEFoBo?}}\\

====Variations==== 
  * Compare antifreeze with salt water to see how each resists freezing.  




====Safety Precautions====
  * Safety glasses required.  
  * Wear cryogenic gloves when handling liquid nitrogen.  
  * Use only in a well-ventilated area to avoid nitrogen gas buildup.  
  * Antifreeze is toxic - do not ingest or allow skin contact. Handle with chemical-resistant gloves if pouring or transferring.  
  * Dispose of antifreeze properly according to local hazardous waste guidelines.  
  * Never seal antifreeze in a container when cooling - expansion may cause it to burst.  





====Questions to Consider====
  * What ingredient in antifreeze lowers its freezing point?  
  * Why does liquid nitrogen sometimes thicken antifreeze instead of making it a solid block?  
  * How does freezing point depression relate to colligative properties of solutions?  
  * Why is antifreeze useful in car engines during winter?  
  * Would salt water or sugar water behave the same way when placed in liquid nitrogen?