Arrange the following materials in the order of increasing elasticity `:` steel , copper , glass and rubber.

Explanation

To arrange the materials steel, copper, glass, and rubber in the order of increasing elasticity, we need to understand the concept of elasticity. Elasticity is the ability of a material to return to its original shape after being deformed.

### Step-by-Step Solution:

1. **Understanding Elasticity**:
- Elasticity is a measure of how much a material deforms under stress and how well it returns to its original shape once the stress is removed.

2. **Identifying the Materials**:
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