## Expansion of a system

Chase Yonamine 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

### Expansion of a system

How can one tell if a system is expanding or not? What criteria do we look for?

Ashley Zhu 1A
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

### Re: Expansion of a system

If a system is doing work, it is usually expanding unless the problem specifically states that the system is at constant volume.

megan blatt 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

### Re: Expansion of a system

A system is expanding if the system is doing work. You can tell that it is expanding if w is negative because this means the system is losing energy through doing work.

Gracie Ge 2E
Posts: 28
Joined: Wed Nov 21, 2018 12:19 am

### Re: Expansion of a system

you can think of expansion (as in when w is negative) as the system doing something. sometimes the problems would say "system undergoes expansion" but actually it's up to you to figure out whether it's w<0 or not.

Kenan Kherallah 2C
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

### Re: Expansion of a system

Expansion relates to an increase in volume occupied (which corrolates to an increase in number of moles)

Brian Chang 2H
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

### Re: Expansion of a system

A system is typically expanding when it is doing work.

This is usually denoted by a negative (w) value as work is being done BY the system, so therefore energy is leaving the system.

Pritish Patil 1K
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

### Re: Expansion of a system

You can tell when work is being done and the volume of the system is changing.

Rhea Churi 4K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

### Re: Expansion of a system

Volume increases and system does work are ways to tell if expansion is happening.