What are the two factors responsible for the liquefaction of gases ?

Explanation

To answer the question about the two factors responsible for the liquefaction of gases, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Liquefaction of Gases**:
- Liquefaction is the process by which gases are converted into liquids. This typically occurs under certain conditions of temperature and pressure.

2. **Identifying the First Factor - Low Temperature**:
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