Why is tin combined with copper to make bronze?

Tin is combined with copper to create bronze primarily to enhance the material's physical and mechanical properties compared to pure copper.1

The addition of tin provides several key advantages:

• Increased Hardness and Strength: Alloying copper with tin makes the resulting metal significantly harder and stronger than pure copper.1
• Improved Castability: Bronze is more fusible, meaning it has a lower melting point and is more readily melted, which makes it easier to cast into shapes.1
• Corrosion Resistance: Bronze is far more resistant to corrosion than pure copper, making it highly durable for tools, weapons, and other implements.1

Because pure tin is relatively weak, it is rarely used for structural purposes on its own; however, when alloyed with copper, it creates a versatile material that has been historically significant since the Bronze Age.2