Closed system and Midterm

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Teresa Chan 2G
Posts: 9
Joined: Wed Sep 21, 2016 2:57 pm

Closed system and Midterm

Postby Teresa Chan 2G » Sun Mar 19, 2017 12:42 pm

Can be volume change in a closed system?
I read that there can be, for example if there's a piston but I'm not sure. But if that's true then why on #2 in the midterm is U=0 in a closed system if the volume can change? Even though q=0, can't there be work?

Madeline Fox 2B
Posts: 25
Joined: Wed Sep 21, 2016 2:59 pm

Re: Closed system and Midterm

Postby Madeline Fox 2B » Sun Mar 19, 2017 1:12 pm

Closed system just means that energy can be added/removed, and this can happen by heating or compression. So yes. In an open system, on the other hand, matter can be added/removed as well as energy.

DamianW
Posts: 35
Joined: Fri Sep 29, 2017 7:06 am

Re: Closed system and Midterm

Postby DamianW » Sun Jan 14, 2018 9:32 am

So what’s an example of a closed system?

Christy Zhao 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Closed system and Midterm

Postby Christy Zhao 1H » Sun Jan 14, 2018 10:38 am

In section 8.1 of the book, it gives an example of a closed system: a cold pack. Energy can be exchanged, but not matter.


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