Why is sulphur not used as a fuel even though it can burn in air to produce heat?

Explanation

**Step-by-Step Solution:**

1. **Understanding Combustion**: First, we need to recognize that combustion is a chemical process where a substance reacts with oxygen to produce heat and light. Sulfur can undergo combustion in air.

2. **Combustion of Sulfur**: When sulfur burns in the presence of oxygen, it forms sulfur dioxide (SO₂) and releases heat. The reaction can be represented as:
\[ S + O_2 \rightarrow SO_2 + \text{Heat} \]
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