Thermodynamics

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504999222
Posts: 25
Joined: Tue Nov 13, 2018 12:18 am

Thermodynamics

Postby 504999222 » Thu Feb 06, 2020 11:20 am

Just to clarify, when heat is transferred from the system and work done by the system, does it carry a negative sign to show that the energy of the system decreases in both cases? At first, I assumed it would be only the system, but my peers are saying it's both.

Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Re: Thermodynamics

Postby Aman Sankineni 2L » Thu Feb 06, 2020 1:09 pm

Heat transfer to a system is positive, and heat transfer from a system is negative. W is positive if work is done by the system, and negative if work is done on the system.

Wendy 1E
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Joined: Sat Aug 17, 2019 12:17 am
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Re: Thermodynamics

Postby Wendy 1E » Thu Feb 06, 2020 1:45 pm

When heat is transferred from the system and work is done by the system, both heat and work are negative. This is because when heat is transferred from the system, the system loses heat (hence the negative q). When work is done by the system, the system is losing energy (hence work is negative).

Maika Ngoie 1B
Posts: 97
Joined: Fri Aug 02, 2019 12:16 am

Re: Thermodynamics

Postby Maika Ngoie 1B » Sun Feb 09, 2020 7:27 pm

Aman Sankineni 2L wrote:Heat transfer to a system is positive, and heat transfer from a system is negative. W is positive if work is done by the system, and negative if work is done on the system.


So I would say that in this case, both are negative.

Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Re: Thermodynamics

Postby Aman Sankineni 2L » Mon Feb 10, 2020 8:21 pm

Yup, both would be negative.

Michelle Xie 2B
Posts: 99
Joined: Sat Aug 17, 2019 12:18 am

Re: Thermodynamics

Postby Michelle Xie 2B » Tue Feb 11, 2020 2:57 pm

both would be negative since the system is losing energy.

Anish Natarajan 4G
Posts: 51
Joined: Thu Jul 25, 2019 12:16 am

Re: Thermodynamics

Postby Anish Natarajan 4G » Tue Feb 11, 2020 2:58 pm

When work is done on a system, the sign is positive; when work is done by a system, the sign is negative


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