In which process P-V diagramis a stright line parallel to the volume axis ?

Options

A. Iochoric
B. Isobaric
C. Isothermal
D. Adiabatic

Answer

To determine in which thermodynamic process the P-V diagram is a straight line parallel to the volume axis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Axes**:
- The P-V diagram has pressure (P) on the y-axis and volume (V) on the x-axis. A straight line parallel to the volume axis indicates that pressure remains constant while volume changes.

2. **Identify the Characteristics of the Process**:
- If the line is parallel to the volume axis, it means that as the volume increases or decreases, the pressure does not change. This is a key characteristic of a specific thermodynamic process.

3. **Recall Thermodynamic Processes**:
- There are four main thermodynamic processes to consider:
- **Isobaric Process**: Pressure remains constant.
- **Isochoric Process**: Volume remains constant.
- **Isothermal Process**: Temperature remains constant.
- **Adiabatic Process**: No heat exchange occurs.

4. **Analyze Each Process**:
- **Isochoric Process**: Volume is constant, so the P-V diagram would be a vertical line, not parallel to the volume axis.
- **Isobaric Process**: Pressure is constant, so the P-V diagram would be a horizontal line, parallel to the volume axis.
- **Isothermal Process**: Temperature is constant, leading to a hyperbolic curve on the P-V diagram.
- **Adiabatic Process**: Similar to isothermal but steeper and also not a straight line.

5. **Conclusion**:
- The process where the P-V diagram is a straight line parallel to the volume axis is the **Isobaric Process**.

### Final Answer:
The process in which the P-V diagram is a straight line parallel to the volume axis is the **Isobaric Process**.