{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture_25 - happens to T P V What sign does W have...

Info icon This preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Thermodynamics
Image of page 1

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

View Full Document Right Arrow Icon
Thermodynamics How do heat and other forms of energy exchange between systems. What are the limits? Objects are no microscopically identical but have the same macroscopic properties (P, V, N, T). Interactions between systems (forces, energy transfer) can be described by work done by one on the other or heat flow between them.
Image of page 2
0 th Law Review: If two systems are both in thermal equilibrium with a third system, then they are in thermal equilibrium with each other
Image of page 3

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

View Full Document Right Arrow Icon
1 st Law If some heat, Q, flows into a system, the system does some work, W, on its environment, then the internal energy of the system changes by Δ U = U f U i = Q W Thermodynamic process
Image of page 4
Positive or Negative? Example: Consider a balloon for which W = Q. What can we say about the thermodynamic process (e.g. What can we say about what
Image of page 5

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

View Full Document Right Arrow Icon
Image of page 6
Image of page 7

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

View Full Document Right Arrow Icon
Image of page 8
Image of page 9

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

View Full Document Right Arrow Icon
Image of page 10
Image of page 11

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

View Full Document Right Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: happens to T, P, V) What sign does W have? Calculating Work We can plot P-V diagrams. The area under the curve is W. W = F Δ x F = PA W = P ( A Δ x )= P Δ V Fixed Quantities Fixed Quantities W = n RT ln ( V f V i ) Fixed Quantities P ∝ 1 V γ Δ U =− W Example: Here W>0. What can we say about T? The Path Makes a Difference Reversibility Reversible: When a process is reversed, the final state (of the system and the environment) is exactly the same as the initial state. Irreversible: There is no way to return the system and its environment to the original state 2 nd Law Heat flows spontaneously from a warm body to a colder one. It is not possible for heat to flow spontaneously from a cold body to a warmer one....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern