The outermost zone of a candle flame is the :

Options

A. least hot part
B. coldest part
C. hottest part
D. moderately hot part

Answer

To answer the question "The outermost zone of a candle flame is the:", we need to understand the structure of a candle flame and its different zones. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Candle Flame Structure**: A candle flame consists of three distinct zones: the outer zone, the middle zone, and the inner zone. Each of these zones has different characteristics.

2. **Identifying the Zones**:
- **Outermost Zone**: This is the area that is farthest from the wick. It is known as the non-luminous zone.
- **Middle Zone**: This zone is called the luminous zone, which is where the flame appears yellow.
- **Innermost Zone**: The innermost zone is known as the dark zone, which is the least hot part of the flame.

3. **Characteristics of the Outermost Zone**:
- The outermost zone (non-luminous zone) is blue in color.
- It is the hottest part of the flame due to complete combustion occurring in this area.

4. **Conclusion**: Based on the characteristics of the zones, the outermost zone of a candle flame is the **non-luminous zone**.

### Final Answer:
The outermost zone of a candle flame is the **non-luminous zone**.

---