Here's a breakdown:
* Structure: Glass is an amorphous solid, meaning its molecules are arranged randomly, unlike the ordered structures of crystals. This random arrangement means there are no natural weak points where it's likely to break cleanly.
* Breaking: When glass breaks, it shatters in an unpredictable way. The fractures create uneven, jagged edges that can be very sharp.
* Hardness: Glass is also relatively hard. This means it's difficult to deform or bend, making it more likely to break into sharp pieces rather than dull ones.
Think of it this way:
* Imagine a piece of paper tearing. It's not a perfect tear, and the edges are irregular.
* Now imagine that paper is extremely hard and rigid. The tear will be even more jagged and uneven, with sharp points.
That's similar to how glass fractures. The hardness and the random arrangement of its molecules create those dangerous sharp edges.