Why does the flame of candle rise up to a good height on burning?

Explanation

### Step-by-Step Solution:

1. **Understanding the Composition of a Candle Flame**:
- When a candle burns, it produces a flame that consists of hot gases. These gases are formed from the combustion of the wax in the candle.

2. **Expansion of Gases**:
- As the candle burns, the heat generated causes the gases in the flame to expand. This expansion occurs because heating a gas increases its energy, causing the molecules to move faster and spread apart.

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