## Isolated System

Vonny Chong
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

### Isolated System

Based on the first law of thermodynamics, can we assume that even after an infinite amount of time, ΔU in an isolated system is 0?

Kelly Duong 2D
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

### Re: Isolated System

As long as it is an isolated system, ΔU should be zero because no heat can flow in or out, and no external force can be applied.

004932366
Posts: 31
Joined: Wed Nov 22, 2017 3:00 am

### Re: Isolated System

An isolated system is defined as a thermodynamic system in which neither energy or matter can be exchanged with the surroundings. Work and heat can be done within the system, but this must be distinguished with whether or not there is a CHANGE in the internal energy within the system. The first law of thermodynamics states that energy is conserved within a system. In an isolated system, energy is converted from one form to another but never leaves the system. So yes, no matter what time, an isolated system will show no change in internal energy.

004932366
Posts: 31
Joined: Wed Nov 22, 2017 3:00 am

### Re: Isolated System

An isolated system is defined as a thermodynamic system in which neither energy or matter can be exchanged with the surroundings. Work and heat can be done within the system, but this must be distinguished with whether or not there is a CHANGE in the internal energy within the system. The first law of thermodynamics states that energy is conserved within a system. In an isolated system, energy is converted from one form to another but never leaves the system. So yes, no matter what time, an isolated system will show no change in internal energy.

Henry Dudley 1G
Posts: 61
Joined: Fri Sep 28, 2018 12:16 am

### Re: Isolated System

Does an isolated system have a fixed volume?

Katelyn Phan 2A
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### Re: Isolated System

ΔU is zero because it can't be heated and no material can be added. Therefore, there's no work nor is there q.

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