Name the process by which heat is transferred within a liquid (or gas).

Answer

To solve the question, "Name the process by which heat is transferred within a liquid (or gas)," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Heat Transfer**:
- Heat can be transferred in three ways: conduction, convection, and radiation. Each method has its specific medium and conditions under which it operates.

2. **Identifying the Medium**:
- The question specifically asks about heat transfer in liquids and gases. This indicates that we are looking for a process that operates in these states of matter.

3. **Exploring the Processes**:
- **Conduction**: This process occurs primarily in solids, where heat is transferred through direct contact between particles.
- **Convection**: This process occurs in liquids and gases. It involves the movement of the fluid itself, where warmer, less dense areas rise and cooler, denser areas sink, creating a cycle that transfers heat.
- **Radiation**: This process does not require a medium and can occur in a vacuum. It involves the transfer of heat through electromagnetic waves.

4. **Conclusion**:
- Since the question specifies heat transfer within liquids and gases, the correct answer is convection.

### Final Answer:
Heat is transferred within a liquid (or gas) by **convection**.

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