Solving a Conceptual Problem: Internal Energy Constant

[Deoxygenation]

This sort of question might be hard since its very general, but I got it off a mutiple choice exam, and I was trying to figure what each choice belong to, I got 4 out of 5 of them, but one of them sort of stumps me, maybe you guys know what it is...

The question ask

---In an isobaric process:

Which of course, is that the pressure remains constant.

And the other choices were

A. The volume remains constant = Isovolumetric
B. The temperature remains constant = Isothermal
C. The pressure remains constant = Isobaric
D. No heat is transferred between a system and its surroundings = Adiabatic
E. The internal energy is constant --- (?)

On part E, I have no idea what type of process that could be to keep internal energy constant. That is the question I'm asking, I just gave the rest of the details, because they all sort of relay to each other, and hopefully may bring some memory or thought of what it could be.

Thanks for any help given :+)

 

[AvroArrow]

The answer to part E is Isometric. An isometric process is one in which the internal energy of the system remains constant.

 

[Moetasim]

As a scientist, my response to this question would be that the correct answer is E. In an isobaric process, the pressure remains constant, but the internal energy can still change. Therefore, E is the only statement that is not necessarily true for an isobaric process.

However, there are certain processes in which the internal energy remains constant, such as an isochoric process (also known as an isovolumetric process), where the volume remains constant and no work is done. In this case, the internal energy remains constant because there is no change in volume or work being done.

Another example is an adiabatic process, where no heat is transferred between the system and its surroundings. In this case, the internal energy also remains constant because there is no heat being added or removed from the system.

Overall, it is important to note that the internal energy of a system can change in various processes, but it is only constant in specific cases such as an isochoric or adiabatic process. It is important to understand the specific conditions and assumptions of a process in order to correctly identify the changes in internal energy.