The trick to the hiss and fizz of pop rocks is all in the manufacturing process.
This candy has tiny, pressurized carbon dioxide bubbles trapped within the sugar matrix during processing. If stored under cool and dry conditions, the bubbles should remain entrapped within the candy.
It's a whole different story when you toss a handful of pop rocks into your mouth. Here, the hot temperature of your mouth and the action of saliva start to dissolve the sugar and release the gas bubbles. It's the high pressure finally be freed that is responsible for the audible sounds.
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