Energy Change in an Isolated System

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Alexandra Carpenter 1G
Posts: 32
Joined: Sat Jul 22, 2017 3:00 am

Energy Change in an Isolated System

Postby Alexandra Carpenter 1G » Wed Jan 17, 2018 1:34 pm

Since there is no matter or energy transfer from an isolated system to its surroundings, there is no way to change the internal energy of an isolated system correct?

Naveed Zaman 1C
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am
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Re: Energy Change in an Isolated System

Postby Naveed Zaman 1C » Wed Jan 17, 2018 1:35 pm

Yup, that's pretty much describing the first law of thermodynamics, which states that the internal energy in an isolated system will not change.

Maeve Gallagher 1J
Posts: 56
Joined: Fri Sep 29, 2017 7:07 am

Re: Energy Change in an Isolated System

Postby Maeve Gallagher 1J » Wed Jan 17, 2018 3:00 pm

Exactly, in order to change the internal energy of the system there must be a transfer of energy as heat, which cannot happen in with an isolated system.

Chew 2H
Posts: 34
Joined: Fri Sep 29, 2017 7:05 am

Re: Energy Change in an Isolated System

Postby Chew 2H » Wed Jan 17, 2018 4:16 pm

So does that mean deltaU=q+w does not apply to an isolated system?

905022356
Posts: 48
Joined: Mon Oct 02, 2017 7:19 am

Re: Energy Change in an Isolated System

Postby 905022356 » Wed Jan 17, 2018 6:57 pm

The internal energy of the system will not change, because no work or heat can be applied to the system, so there is no point in finding delta u. Delta U for this case will always equal 0.


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