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======Dry Ice Fog======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Dry Ice Fog Effects
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Ensure the room is well ventilated
  - Pour some warm water into a bucket or plastic container.
  - Add dry ice, and fog is produced that moves downward to the floor.


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====Links==== 
How To Make The Perfect Fog Effect Using Dry Ice! - Chillistick: {{youtube>BsO1B-FWD6I?}}\\
In a giant pool: TechRax: {{youtube>1uUFI0w5Tj0?}}
📄 How To Make A Big Fog Effect - Chillistick: [[https://www.chillistick.com/user/downloads/Primary%20Science%20Pack%20Experiments.pdf]]\\



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/* VARIATIONS - Optional                                                                               */
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====Variations====
  * Compare fog made with hot water versus cold or chilled water.
  * Dim the room lights and shine a flashlight through the fog to show light scattering.


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====Safety Precautions====
  * Adult supervision required; keep students seated and at a distance.
  * Use hot water only after letting a freshly boiled kettle cool for a few minutes to reduce scald risk.
  * Wear insulated or dry-ice handling gloves when loading dry ice.
  * Never seal dry ice in a closed container; use the vented lid provided.
  * Ensure good ventilation; keep doors/windows open during the demo.
  * Do not allow students to touch dry ice; it can cause cold burns.
  * Students must not remove dry ice from the demonstration area.
  * Mop up any condensation on the floor to prevent slipping.


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====Questions to Consider====
  * Why does the fog flow downward instead of rising? (The fog contains carbon dioxide and tiny water droplets, making the mixture denser than air, so it sinks.)
  * What changes if you use cold water instead of hot water? (Less fog forms because colder water provides less heat to drive sublimation and condensation.)
  * Why does the fog look white? (Light scatters from the tiny suspended water droplets, similar to clouds and natural fog.)
  * How could you make an even bigger fog effect safely? (Use slightly hotter water (still below boiling), a bit more dry ice, and maintain ventilation while keeping the container vented.)


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