A combustible substance cannot catch fire or burn as long as its temperature is lower than its ignition temperature. Explain with examples.

Explanation

### Step-by-Step Solution:

1. **Definition of Ignition Temperature**:
- The ignition temperature is the minimum temperature at which a combustible substance starts to burn. Below this temperature, the substance will not ignite or catch fire.

2. **Example of Cooking Oil**:
- When cooking oil is placed in a frying pan on a burning stove, it does not catch fire immediately, even after being heated for a long time. This is because the temperature of the cooking oil has not yet reached its ignition temperature.

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