In this \((P\text -V)\) diagram below the dashed curved line is adiabatic.

For a process, that is described by a straight line joining two points \(X\) and \(Y\) on the adiabat (solid line In the diagram) heat is:
(consider the variations in temperature from \(X\) to \(Y\) along the straight line.)
| 1. |
absorbed throughout from \(X\) to \(Y.\) |
| 2. |
released throughout from \(X\) to \(Y.\) |
| 3. |
absorbed from \(X\) up to an intermediate point \(Z\) (not shown In the figure) and then released from \(Z\) to \(Y.\) |
| 4. |
released from \(X\) up to an Intermediate point \(Z\) (not shown in the figure) and then absorbed from \(Z\) to \(Y.\) |