Children, do you know what dry ice is? Did the teacher teach you some common knowledge about school fire control? We all know that there is dry ice in the fire extinguishing device. Learn what dry ice is from me.

(left) Dry ice bricks sold to dry ice factories; (Right) Hot water injected with dry ice produces a sinking white fog.

Dry ice is solid carbon dioxide with a temperature of -78.5℃. When it is heated into gas, it condenses the water vapor in the nearby air into countless small water droplets, which is white fog. If you pour hot water on dry ice, the white fog will be thick, just like a fairyland. This method is often used to create a fairyland on the stage.