Concept:
Thermodynamic processes are classified based on how heat, pressure, volume, and temperature behave.
Step 1: Understanding the definition.
A process in which
no heat is exchanged between the system and surroundings is called an
adiabatic process.
Step 2: Key characteristic.
\[
Q = 0
\]
where \(Q\) is heat transfer.
Step 3: Eliminating incorrect options.
- Isothermal: temperature constant.
- Isobaric: pressure constant.
- Isochoric: volume constant.
Conclusion:
Thus, the correct answer is
Adiabatic process.