How many zones are there in a flame ?

Explanation

To answer the question "How many zones are there in a flame?", we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding the Flame**: A flame is produced when a fuel undergoes combustion. In a typical candle flame, we can observe different characteristics in various parts of the flame.

2. **Identifying the Zones**: There are three distinct zones in a candle flame:
- **Non-luminous Zone**: This is the outermost zone of the flame. It is known for complete combustion, where the fuel burns completely, producing a blue flame. This zone is the hottest part of the flame.
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