What is hardened?

Hardened means something has become really strong and tough by going through a special process.

Imagine you have a piece of clay, it's soft and squishy. Now imagine putting it in the oven, then cooling it down quickly. That’s like what happens to hardened things! The heat makes them change inside, and when they cool fast, they get super strong, like a rock.

• You start with something that's soft or weak, maybe metal or glass.
• Then you heat it up to make it easier to shape.
• After heating, you cool it down really fast, which makes it hard and tough.

It’s like when you put ice cream in the freezer after warming it up. It gets harder than before!

People use this process to make tools, knives, and even parts of cars, things that need to stay strong and not break easily. So hardened means made really tough through heat and fast cooling.