Define galvanisation.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Concept**: Galvanization is a protective process applied to metals, particularly iron, to prevent corrosion.

2. **Definition**: Galvanization is the process of applying a thin layer of zinc to iron or steel. This layer acts as a barrier to moisture and oxygen, which are the primary causes of rusting.

3. **Purpose**: The main purpose of galvanization is to protect iron and steel from rusting, thereby extending the life of the metal products.

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