In ________change, the internal composition of the substance does not change.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about a type of change where the internal composition of a substance remains unchanged.

2. **Identifying Types of Changes**: There are two main types of changes in chemistry: physical changes and chemical changes. It's important to differentiate between them.

3. **Defining Physical Change**: A physical change is a change that affects one or more physical properties of a substance. During a physical change, no new substances are formed, and the internal composition remains the same.

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