======Boiling Water with Ice======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Alternative titles:** Lowering Boiling Point with Pressure
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====Summary====                   
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====Procedure====  
  - Fill a flat-bottomed glass flask with water and bring it to a boil using a hot plate.  
  - Remove the flask from the heat and immediately seal it with a bung.  
  - Allow the flask to cool slightly for about a minute.  
  - Invert the flask and secure it on a ring stand.  
  - Place ice cubes on the flat bottom of the flask.  
  - Observe as the water begins to boil again, despite cooling.



====Links==== 
Boiling Water Using Ice - mrsciguy: 
{{youtube>zzVtbvVS2lQ?}}\\

Boiling Water with Ice - Pueblo Science: 
{{youtube>9FqZgDQGgBk?}}\\

📄 Boiling Water with Ice - MettLink: [[https://www.metlink.org/experiment/boiling-water-with-ice/]]\\


====Variations====
  * Try the experiment at different starting water volumes to compare boiling intensity. 
  * Relate the experiment to high-altitude cooking by simulating different pressure conditions.


====Safety Precautions====
  * Use heatproof gloves when handling hot glassware.  
  * Ensure the flask is borosilicate glass to withstand thermal stress.  
  * Perform the experiment on a heatproof mat.  
  * Handle boiling water carefully to avoid burns.  
  * Do not continue boiling the water once the flak has been stoppered.




====Questions to Consider====
  * Why does the water start boiling again when ice is applied? (The cooling reduces internal pressure, lowering the boiling point of water.)  
  * How does this experiment relate to atmospheric pressure? (At higher altitudes, lower air pressure lowers the boiling point of water, just like in the flask.)  
  * Why is it difficult to brew tea properly on Mount Everest? (At 330 mb, water boils at about 70°C, too cool to extract flavor effectively.)  
  * What real-world systems rely on pressure to change boiling points? (Vacuum distillation, refrigeration, and pressure cookers.)