Have you started decorating for Halloween yet? Here is a science-y jack-o-lantern idea for you to try. I did not set this Halloween jack o lantern on fire, yet it still has a scary and spooky vibe. This is an easy effect to produce. Carve your pumpkin or use a plastic or foam jack o lantern. Place a dish of hot water inside the pumpkin. Alternatively, you can pour the water directly into the jack o lantern. Add a couple of pieces of dry ice. Light birthday candles for eyes. Note that dry ice sublimates to form carbon dioxide gas, which is a natural fire extinguisher. The reason the candles burn is because the carbon dioxide fog is heavier than air, so it sinks. When the fog dies down you can add more dry ice and hot water to keep it going. If you don't have dry ice, you can plug in a water vaporizer to create the fog instead.
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