Pop Rocks work by trapping pressurised carbon dioxide gas inside tiny pockets within the candy during manufacturing. When the molten sugar cools and hardens, these gas bubbles become sealed inside the crystal structure. As the candy dissolves in your mouth, the sugar releases the trapped gas, causing the characteristic popping and crackling sensations.

This reaction mimics the effect of miniature carbonation bursts similar to the bubbles in fizzy drinks but in solid form. The rapid release of gas creates both the physical “pop” felt on the tongue and the audible crackling sound, producing a unique multisensory experience.