The Secret Behind The 'Popping' Of Pop Rock Candy

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The secret behind the “popping” of pop rocks candy is pressurized carbon dioxide gas. Each of the tiny little candy pebbles contains a small amount of gas. These tiny carbon dioxide bubbles make the popping sound you hear when they burst free from their candy shells. So what causes the balloon to inflate? The carbon dioxide contained in the candy isn't enough to cause even the small amount of inflation you observe in the experiment.That's where the soda comes into play. The soda also contains pressurized carbon dioxide gas. When the pop rocks are dropped into the soda, some carbon dioxide is able to escape from the high fructose corn syrup of the soda and because the carbon dioxide gas has nowhere to go in the bottle, it rises into the balloon.

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