Expansion of a system

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

Expansion of a system

Postby Chase Yonamine 1J » Thu Feb 14, 2019 12:42 pm

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

Postby Ashley Zhu 1A » Thu Feb 14, 2019 2:30 pm

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

Postby megan blatt 2B » Thu Feb 14, 2019 3:05 pm

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

Postby Gracie Ge 2E » Thu Feb 14, 2019 6:12 pm

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

Postby Kenan Kherallah 2C » Thu Feb 14, 2019 6:26 pm

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

Postby Brian Chang 2H » Fri Mar 01, 2019 2:25 pm

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

Postby Pritish Patil 1K » Thu Mar 14, 2019 12:51 pm

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

Postby Rhea Churi 4K » Thu Mar 14, 2019 1:26 pm

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


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