Audience-Pleasing Physical Models to Support CO₂ Outreach

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Materials and supplies

Demo 1 [Go to Demo]

• Styrofoam balls in three sizes (1, 1¼, 1½ inch)
• Paint to color balls in three contrasting colors
• Precut, 1-inch-long pieces of pipe cleaner
• Candle and match

Demo 2 [Go to Demo]

• 5-lb bag of charcoal briquettes
• Large white garbage bag (on which to spread briquettes )
• Premoistened towelettes for clean up

Demo 3 [Go to Demo]

• Two 10" × 10" sheets of 4 wires/inch (¼-inch mesh), galvanized hardware cloth from a builders’ supply store
• Tape to seal sharp cut ends of hardware cloth
• Several ordinary pipe cleaners from a craft shop

Demo 4 [Go to Demo]

• 10-gallon aquarium or similar container
• Plastic tray to fit inside aquarium (dry ice placed directly on glass may crack it; a container provides insulation)
• Bubbles and bubble-blowing wand from a toy store
• Candle
• Matches or lighter
• Several clear-plastic 12-oz cups
• Two hot pads (gloves also work) for safe handling of dry ice
• Several 1-pint water bottles filled with drinking water
• Ice pick
• Plastic bag to cover work surface
• 5- to 12-lb block of dry ice
• Small Styrofoam ice chest for transporting dry ice

Demo 5 [Go to Demo]

• Clear glass marbles from hobby or garden supply (enough to fill the jar); better if not of uniform size
• 1-quart jar (clear, with water-tight lid)
• Colored lamp oil from hobby or hardware store
• Tap water to fill jar