Step 1: Understanding the Question:
We use the First Law of Thermodynamics to relate heat, work, and internal energy for various processes.
Step 2: Key Formula or Approach:
First Law of Thermodynamics: $Q = \Delta U + W_{by}$, where $W_{by}$ is work done BY the system.
Equivalently, $Q = \Delta U - W_{on}$, where $W_{on}$ is work done ON the system.
Step 3: Detailed Explanation:
Given: $\Delta U = W_{on}$.
Substituting this into the first law:
\[ Q = \Delta U - \Delta U = 0 \]
A process in which there is no heat exchange ($Q = 0$) between the system and its surroundings is called an Adiabatic process.
In such a process, all work done on the system is stored as internal energy.
Step 4: Final Answer:
The system undergoes an adiabatic process.