The air is heated near the source gets hot and rises up. The air from the sides and takes its place. Similarly the air also heated by oil heaters. Which process is this?

Options

A. Convection
B. Radiation
C. Diffusion
D. Operations

Explanation

**Step-by-Step Solution:**

1. **Understanding the Process**: The question describes a situation where air is heated near a source, causing it to rise. As the hot air rises, cooler air from the sides moves in to take its place. This movement of air is crucial to identifying the process involved.

2. **Identifying the Type of Heat Transfer**: The process described involves the movement of a fluid (in this case, air) due to differences in temperature and density. When air is heated, it becomes less dense and rises, while cooler, denser air moves in to fill the space left by the rising hot air.

3. **Recognizing Convection**: The movement of air as described is a classic example of convection. In convection, heat is transferred through the movement of fluids (liquids and gases). The warmer, less dense fluid rises, and the cooler, denser fluid sinks, creating a continuous circulation pattern.

4. **Conclusion**: Therefore, the process described in the question is called **convection**.

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