isothermal system  [ENDORSED]

isochoric/isometric:
isothermal:
isobaric:

Moderators: Chem_Mod, Chem_Admin

Tiffany Cao 1D
Posts: 94
Joined: Fri Sep 29, 2017 7:03 am
Been upvoted: 1 time

isothermal system

Postby Tiffany Cao 1D » Sat Feb 10, 2018 1:59 pm

How is heat being transferred in an isothermal system?

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

Re: isothermal system  [ENDORSED]

Postby Chem_Mod » Sat Feb 10, 2018 2:10 pm

Isothermal means temperature does not change and therefore internal energy does not change.
Delta U = q + w
0 = q + w

Therefore -q = w
Or w = -q

Heat is transferred (not zero) but the same amount of energy is lost as work. Therefore internal energy is constant.

If needed, ask during my Monday review session.

Anne 2L
Posts: 35
Joined: Fri Sep 29, 2017 7:05 am

Re: isothermal system

Postby Anne 2L » Tue Feb 13, 2018 1:45 pm

Chem_Mod wrote:Isothermal means temperature does not change and therefore internal energy does not change.
Delta U = q + w
0 = q + w

Therefore -q = w
Or w = -q

Heat is transferred (not zero) but the same amount of energy is lost as work. Therefore internal energy is constant.

If needed, ask during my Monday review session.



Can you clarify how no change in temperature means no change in internal energy? Sorry, I'm kind of confused because I don't see temperature in the change in internal energy equation

Lily Guo 1D
Posts: 64
Joined: Fri Sep 29, 2017 7:03 am

Re: isothermal system

Postby Lily Guo 1D » Tue Feb 13, 2018 2:31 pm

There is no temperature change because energy from heat transfer is equal to energy from work. If they weren't equal, then the energy change from the heat transfer would result in a temperature change. However, because they are equal, the energy supplied by work makes up for that would-be temperature change and makes it isothermal instead.


Return to “Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)”

Who is online

Users browsing this forum: No registered users and 2 guests