## Change in internal energy= 0

EmmaShahabi1L
Posts: 11
Joined: Wed Sep 21, 2016 2:55 pm

### Change in internal energy= 0

What are the necessary circumstances for a system's change in internal energy to be 0?

Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

### Re: Change in internal energy= 0

One of the conditions when internal energy is zero is when the system has no temperature change, more specifically when the question says "isothermal".

904826427
Posts: 16
Joined: Wed Sep 21, 2016 2:55 pm

### Re: Change in internal energy= 0

Sakina_Qadir_3K wrote:One of the conditions when internal energy is zero is when the system has no temperature change, more specifically when the question says "isothermal".

But can't work still occur, so the internal energy would not be zero?

904826427
Posts: 16
Joined: Wed Sep 21, 2016 2:55 pm

### Re: Change in internal energy= 0

904826427 wrote:
Sakina_Qadir_3K wrote:One of the conditions when internal energy is zero is when the system has no temperature change, more specifically when the question says "isothermal".

But can't work still occur, so the internal energy would not be zero?

Ah, so isothermal means deltaU=0 and adiabatic means q=0

Hannah_El-Sabrout_2K
Posts: 20
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Change in internal energy= 0

904826427 wrote:
Sakina_Qadir_3K wrote:One of the conditions when internal energy is zero is when the system has no temperature change, more specifically when the question says "isothermal".

But can't work still occur, so the internal energy would not be zero?

Yes, you can still have a value for work, but the energy lost as work is being replaced by heat.
deltaU=0=w+q
w=-q