{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 7.ppt second law

# Chapter 7.ppt second law - Chapter 7 The Second and Third...

This preview shows pages 1–8. Sign up to view the full content.

Chapter 7: The Second and Third Law of Thermodynamics

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Spontaneous change Spontaneous changes (natural processes) Heat flows from hot to cold Gas expands in a vacuum A ball will stop bouncing Non-spontaneous changes (unnatural) The reverse of above
Carnot heat engine e system receives heat Q H from the hot reservoir and loses heat Q C to the low mperature reservoir, and does work on the surroundings U = q H + q C + w e second law says that qc cannot be zero, cannot convert q H completely into wo

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Carnot Cycle For the cycle A A Ucyc = 0 = I (q 1 + w 1 ) + II(w 2 ) + III(q 3 + w 3 ) + IV(w 4 ) I II III I V
Carnot Theorem No engine that operates between two heat reservoirs can be more efficient that the reversible Carnot engine. rev

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
The birth of entropy (S) = + = + - = + ∈= 0 give to Rearange 0 1 1 3 1 1 3 1 3 C H H C H C T q T q T T q q T T q q
Entropy (S) It appears that there is a property (q/T) that sums to zero for the cycle. This is a property of a state function. The

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern