Explain why an organic liquid vaporises at a temperature below its boiling point in steam distillation?

Explanation

### Step-by-Step Solution:

1. **Understanding Steam Distillation**:
- Steam distillation is a technique used to separate volatile organic compounds from non-volatile impurities or to isolate essential oils from plant materials. It involves the use of steam to vaporize the organic liquid.

2. **Boiling Point and Vapor Pressure**:
- The boiling point of a liquid is the temperature at which its vapor pressure equals the atmospheric pressure. At this point, the liquid turns into vapor.

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