What Causes the ‘Crunch’ of a Chocolate Bar?

Crunching happens when the chocolate breaks apart. When you bite into or snap a chocolate bar, it makes a crunchy sound because tiny pieces of chocolate move and vibrate quickly, like a lot of little bells ringing at once! This happens even if the chocolate is not melting; just breaking it causes a vibration that we hear as crunch. It’s like when you break an ice cube, you can hear it, too!