Concept: •Isothermal process: \(PV = \text{constant}\) → rectangular hyperbola
•Compression: volume decreases (motion from right to left)
Step 1: Identify isothermal curve
In a \(PV\) graph, isothermal process is represented by a curved (hyperbolic) path.
Step 2: Check direction
Compression means volume decreases, so the path must move from right to left.
Step 3: Analyze given processes •Process III: curved path with decreasing volume → isothermal compression
•Other processes represent expansion or different thermodynamic paths
Conclusion
\[
\text{Isothermal compression corresponds to process III}
\]