## dU, q, w

ntruong2H
Posts: 50
Joined: Sat Jul 09, 2016 3:00 am
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### dU, q, w

In an isolated system, I know dU=0. Does this also mean that q and w=0?

What are the values for q and w in a closed system?

Thanks.

Tara_Shooshani_3N
Posts: 29
Joined: Wed Sep 21, 2016 3:00 pm

### Re: dU, q, w

Since U=0, w=-q

ntruong2H
Posts: 50
Joined: Sat Jul 09, 2016 3:00 am
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### Re: dU, q, w

Tara_Shooshani_3N wrote:Since U=0, w=-q

So q and w don't equal 0? I thought that since it's isolated, it can't expand/contract and heat can't be exchanged so they'd be = 0

204781248
Posts: 22
Joined: Wed Sep 21, 2016 2:55 pm

### Re: dU, q, w

ntruong2H wrote:
Tara_Shooshani_3N wrote:Since U=0, w=-q

So q and w don't equal 0? I thought that since it's isolated, it can't expand/contract and heat can't be exchanged so they'd be = 0

you are right. In an isolated system, heat, mass and energy cannot flow from the system to its surroundings or vice versa so they equal 0.

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