Which of the following are physical changes and which are chemical changes ?
Wool being knitted into a sweater

Explanation

To determine whether the process of knitting wool into a sweater is a physical or chemical change, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Definition of Physical Change**:
- A physical change is a change that does not alter the chemical composition of a substance. It involves changes in physical properties such as shape, size, or state, but no new substance is formed.

2. **Identifying the Process**:
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