The adiabatic process holds true for the long duration of time. However, it gets impossible for the mechanical processes of small time scales as there is no perfect insulator for the isolated system. In this, the heat is always lost when work is done.
Normally, an adiabatic process is the one where the net outcome of temperature remains unchanged. That doesn’t mean there is no transfer of heat in the process.
Types of adiabatic process-
An adiabatic process can be categorized into two processes namely reversible or irreversible.
- In the reversible adiabatic process, the entropy remains constant. It is also called an isentropic process.
- In the irreversible adiabatic process, the entropy doesn’t remain constant.
Consider m kg of air is heated adiabatically from point 1 to point 2, the Pressure-Volume diagram of the process is shown below:
Pressure, volume, and temperature at point 1 are P1, V1, and T1
Pressure, volume, and temperature at point 1 are P2, V2, and T2.
In the P-V diagram shown above, the gas in the piston cylinder is heated adiabatically.