This all has to do with forces. If you press down on a cushion what happens? The cushion gets squashed right? No sound there just a squashed cushion. However, if you press down on a crisp, the crisp breaks and makes a crunching sound right?
Scientists understand this difference by using something called mechanics. Mechanics looks at how pressing hard on objects changes the objects shape and properties.
If objects are made up of tightly packed atoms and molecules, a large force will break them. Otherwise if objects are made up of loosely packed atoms and molecules a force acting on them will make them more tightly packed rather than breaking them.
The crunch is the energy released from the breaking of the crisp and this can be completely understood with mechanics and equations.
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