DS= q/T for surroundings or system?


Moderators: Chem_Mod, Chem_Admin

Miranda 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:06 am

DS= q/T for surroundings or system?

Postby Miranda 1J » Mon Feb 05, 2018 1:19 am

Can we use the equation DS = q/T for both the surroundings and the system?

Sohini Halder 1G
Posts: 58
Joined: Thu Jul 13, 2017 3:00 am
Been upvoted: 1 time

Re: DS= q/T for surroundings or system?

Postby Sohini Halder 1G » Mon Feb 05, 2018 9:51 am

yep! So for instance, if heat is being released from System into Surroundings, System q will be negative and Surroundings q will be positive because the surroundings are absorbing heat. Further, System T should be higher than Surroundings T. These differing values will give you a different change in entropy value for the system versus the surroundings, unless its isothermal, which in that case it will just be opposite signs.

Emily Duggan 1F
Posts: 42
Joined: Fri Sep 29, 2017 7:07 am

Re: DS= q/T for surroundings or system?

Postby Emily Duggan 1F » Mon Feb 05, 2018 9:53 am

Yes, I believe we can use that equation for calculating both ∆S for a system or its surroundings, but you would have to make sure the sign of q on the numerator matches the situation correctly.


Return to “Concepts & Calculations Using Second Law of Thermodynamics”

Who is online

Users browsing this forum: No registered users and 1 guest