A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Hi, I do not quite understand the first law of thermodynamics. My books says that in thermodynamics you consider the mechanical energy as constant. Therefore only the internal energy can vary and thus : dU = dQ + dW (simplified). But I don't get how this means that the total energy in the system remains constant, because if dU is anything different from 0, there's a change in total energy, isn't there? I must be having a wrong view on this, could anyone help me out please? Thanks!

  • This Question is Open
  1. rvc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    we know energy can neither be created nor be destroyed. It can be transformed from one form to another

  2. rvc
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Since energy keeps changing its form it remains constant

  3. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    dQ is heat added. That heat either causes work W to be done by system or increases its internal energy U.

  4. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.