Dry ice is combined with hot water in a lidded bucket to generate a thick white fog that spills over the rim and creeps across the floor.

1. Ensure the room is well ventilated
2. Pour some warm water into a bucket or plastic container.
3. Add dry ice, and fog is produced that moves downward to the floor.

How To Make The Perfect Fog Effect Using Dry Ice! - Chillistick:

In a giant pool: TechRax:

📄 How To Make A Big Fog Effect - Chillistick: https://www.chillistick.com/user/downloads/Primary%20Science%20Pack%20Experiments.pdf

• 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.

• 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.

• 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.)