Movie courtesy of the Little Shop of Physics.
Snuff It! with CO2
This episode of "Science It Up!" from the Little Shop of Physics demonstrates how carbon dioxide gas is more dense than air. To show this, they snuff out the flames of candles invisibly - with the help of some "dry ice". You can't see their carbon dioxide gas, but you can prove that it's there when you watch the flames go out.
Right-click (Windows) or Option-click (Mac) here to download a copy of this video in QuickTime format.
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is the new card game from the Union of Concerned Scientists that teaches kids about the choices we have when it comes to climate change—and how policy and technology decisions made today will matter. Cool It! is available in our online store
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