Then you let the temperature rise. What you are left with is a pure sugar syrup at about degrees F degrees C. When it cools, you have hard candy. To make Pop Rocks, the hot sugar mixture is allowed to mix with carbon dioxide gas at about pounds per square inch psi. The carbon dioxide gas forms tiny, psi bubbles in the candy.
Once it cools, you release the pressure and the candy shatters, but the pieces still contain the high-pressure bubbles look at a piece with a magnifying glass to see the bubbles.
When you put the candy in your mouth, it melts just like hard candy and releases the bubbles with a loud POP! What you are hearing and feeling is the psi carbon dioxide gas being released from each bubble.
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