What is Brittleness?

Brittleness is when something breaks easily when you push or pull on it.

Imagine you have a toothpick, it's tiny and thin. If you try to bend it, it just snaps in two like it’s made of glass. That’s what brittle means: something that breaks quickly without much force. Now think about a rubber band, it stretches and squishes easily. It doesn’t snap when you pull it; it just gets longer. Rubber bands are the opposite of brittle, we call them flexible.

Some materials are naturally brittle, like glass or ceramic, because they don't move much inside when you push on them. They just crack and break quickly. Other things can become brittle if they’re old or dry, like crackers, a fresh one is soft and bendy, but an old one snaps in two if you try to bite it.

So brittleness is about how something reacts when you try to change its shape, some just snap, others stretch and stay whole.