## jrodriguez2315 3 years ago On a p-v diagram, there are constant temperature lines. If the process line is parallel to that of specific volume(that is, constant pressure inside the saturation dome), is there any change in internal energy?

1. jrodriguez2315

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2. Fellowroot

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3. jrodriguez2315

Thanks Fellowroot. Exactly what I was looking for... I didn't need help with the problem itself. I just didn't remember one of the concepts.

4. Fellowroot

Could you explain it to me how your problem works since I'm really not getting the 1, 2, and 3 on your graph. Glad I could help. I actually took thermodynamics, but i don't know everything.

5. jrodriguez2315

Ok. There is a saturated water vapor inside a piston-cylinder that is designed to stop once the volume is .3m^3. The initial pressure is 500kPa, and initial volume is .5m^3. Therefore, P1=P2 (constant pressure). On that pressure line, there is a constant temperature line? Therefore, no change in internal energy.

6. Fellowroot

And you are meaning that the constant pressure line is from 1 to 2 right?

7. jrodriguez2315

That is correct. Isobaric process from 1 to 2.