

Workers make bronze by adding a small amount of melted tin to a larger amount of melted copper. Workers may also add other metals to the bronze to make alloys that are better for certain uses. For example, adding a little bit of lead to copper and tin makes the bronze slippery. This type of bronze is used to make machine parts that slide against each other.

Bronze is an excellent material for making statues, bells, and other artistic objects. After melted bronze is poured into a mold and begins to cool, it expands. As the bronze expands, it fills in every detail of the mold. When the bronze cools further and hardens, it shrinks a little bit. This makes the final object easy to remove from the mold. Bronze also changes colors when exposed to air and water. This effect is called a patina and can be very beautiful.

People first discovered how to make bronze more than 5,000 years ago. The discovery of bronze allowed ancient peoples to make tools and weapons that were stronger and longer lasting than any made before. These advances were so important that the ancient period of bronze making came to be called the Bronze Age. People later began making statues, church bells, doors, bowls, and many other objects out of bronze.

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