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How does Kellogg's* Rice Krispies* cereal "talk"?
During toasting, hot air in the ovens causes the kernels of rice to expand to several times their original size. As the puffs of rice swell, air pockets are formed in the crisp kernel. When milk is poured on the cereal, some of the structure breaks down and causes the distinctive sound.
When RICE KRISPIES* cereal is toasted, the cooked and dried rice "berries" puff to expand to many times their normal size. Since the weight of the rice berry and its material mass remains nearly the same, the rice material is stretched to form very thin walls of the RICE KRISPIES structure. This is much like a very thin glass crystal. When subjected to a change in heat, a severe "stress" is set up and the thin wall fractures - creating snap, crackle and pop sounds.
This happens in a cereal bowl when COLD milk (i.e. heat stress) is poured on the RICE KRISPIES* presto: snap, crackle and pop! The sounds are made by the uneven absorption of milk by the cereal bubbles.
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