The cooling in refrigerator is due to

Options

A. Reaction of the refrigerator gas
B. Expansion of ice
C. The expansion of the gas in the refrigerator
D. The work of the compressor

Explanation

### Step-by-Step Solution:

1. **Understanding the Function of a Refrigerator**:
- A refrigerator works on the principle of removing heat from a low-temperature reservoir (inside the fridge) and transferring it to a high-temperature reservoir (the environment outside the fridge). This process is essential for cooling the contents inside the refrigerator.

2. **Role of Refrigerant**:
- Refrigerators use a refrigerant, which is a gas that undergoes phase changes. The refrigerant absorbs heat from the interior of the refrigerator when it evaporates and releases heat to the environment when it condenses.

3. **Compression and Expansion Processes**:
- The refrigeration cycle involves two main processes:
- **Compression**: The refrigerant gas is compressed by a compressor, which increases its pressure and temperature.
- **Expansion**: The high-pressure gas then passes through an expansion valve, where it expands and its pressure drops, leading to a decrease in temperature.

4. **Temperature Changes**:
- During compression, the temperature of the refrigerant increases due to the work done on it. Conversely, during expansion, the refrigerant cools down as it absorbs heat from the interior of the refrigerator.

5. **Conclusion**:
- The cooling effect in a refrigerator is primarily due to the **expansion of the refrigerant gas**, which absorbs heat from the refrigerator's interior, leading to a drop in temperature.

### Final Answer:
The cooling in a refrigerator is due to the **expansion of the refrigerant gas**.

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