Why two thin blankets put together are warmer than one blanket of double the thickness ?

Options

A. Conductivity depends upon thickness
B. Two blankets enclose a layer of air between them
C. One blanket closes the pores in the other
D. Because of some reason other than those mentioned above

Explanation

To understand why two thin blankets are warmer than one blanket of double the thickness, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Heat Transfer**:
- Heat transfer occurs through conduction, convection, and radiation. In this case, we are primarily concerned with conduction and convection.

2. **Properties of Air**:
- Air is a poor conductor of heat. This means that it does not transfer heat efficiently. When air is trapped, it acts as an insulating layer.

3. **Two Thin Blankets**:
- When two thin blankets are placed on top of each other, they create an air layer between them. This trapped air layer provides additional insulation.

4. **Single Thick Blanket**:
- A single blanket of double the thickness does not trap air in the same way. While it may have more material, it does not create the same insulating effect because there is no air layer between the blanket and the body.

5. **Conclusion**:
- The trapped air between the two thin blankets reduces the heat loss from the body to the environment, making it feel warmer compared to a single thick blanket that lacks this air layer.

### Final Answer:
Two thin blankets are warmer than one blanket of double the thickness because the air trapped between the two blankets acts as an insulator, preventing body heat from escaping. In contrast, a single thick blanket does not trap air in the same way, allowing more heat to escape.

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