Define incomplete and complete combustion.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Combustion**:
- Combustion is a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light.

2. **Complete Combustion**:
- Complete combustion occurs when a fuel burns in the presence of a sufficient or excess supply of oxygen.
- In this process, the fuel is completely oxidized, producing carbon dioxide (CO₂) and water (H₂O) as the primary products.
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