____ is used in the refrigeration of sea food.

Options

A. chlorofluoro carbons
B. dry ice
C. carbon dioxide gas
D. inert gases

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a substance that is used in the refrigeration of seafood. This indicates that we need to identify a cooling agent that is effective in preserving seafood.

2. **Identifying Common Refrigerants**: Common substances used for refrigeration include regular ice, dry ice, and various gases. We need to determine which of these is specifically used for seafood refrigeration.

3. **Considering the Properties of Refrigerants**: Regular ice (made from water) is commonly used, but it may not be the most effective for long-term preservation. Dry ice, which is solid carbon dioxide, is known to be much colder than regular ice.

4. **Temperature Comparison**: Dry ice has an average temperature of approximately -78.5 degrees Celsius. This is significantly lower than the temperature of regular ice, making it more effective for freezing and preserving seafood.

5. **Conclusion**: Given that dry ice (solid carbon dioxide) is colder than regular ice and can quickly freeze seafood, it is the best choice for refrigeration to prevent spoilage.

6. **Final Answer**: The answer to the question is **dry ice**.

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