## When is delta U = 0?

$\Delta U=q+w$

JeremyPark14B
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

### When is delta U = 0?

Under what conditions is delta U = 0?

Salena Chowdri 1I
Posts: 66
Joined: Fri Apr 06, 2018 11:02 am

### Re: When is delta U = 0?

For an isothermal system delta U = 0

kateminden
Posts: 63
Joined: Fri Sep 28, 2018 12:24 am

### Re: When is delta U = 0?

The first law of thermodynamics states that the internal energy (delta U) of an isolated system is constant. This means that delta U = 0 in an isolated system, because no energy can be transferred to/from the system and no work can be done on or is being done by the system.

Claudia Luong 4K
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

### Re: When is delta U = 0?

In isothermal systems, the internal energy does not change so delta U is always equal to zero.

lukezhang2C
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

### Re: When is delta U = 0?

Looking at the equation Delta U = q + w, delta U is only 0 when q = -w which means heat put into the system is equal to the heat out of the system, in other words the system is isolated with no net change in internal energy.