Work for compression/expansion


and

Moderators: Chem_Mod, Chem_Admin

Melodie Oh 2A
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

Work for compression/expansion

Postby Melodie Oh 2A » Thu Jan 18, 2018 9:55 pm

Can someone explain why the value for work is positive when it is compression and why it is negative when it is expansion??

SantanaRodriguezDis1G
Posts: 56
Joined: Sat Jul 22, 2017 3:00 am

Re: Work for compression/expansion

Postby SantanaRodriguezDis1G » Thu Jan 18, 2018 9:58 pm

The negative indicates that the system is losing energy

Lindsay H 2B
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

Re: Work for compression/expansion

Postby Lindsay H 2B » Thu Jan 18, 2018 10:14 pm

I like to think of it as how when something is compressed (like the air in the bicycle pump in problem 8.3) it means work is being done on the system, so the system gains energy (positive work). In an opposite scenario if the air in the bicycle pump were allowed to expand, the energy for the expansion comes from inside the system, therefore the system loses energy (negative work).


Return to “Calculating Work of Expansion”

Who is online

Users browsing this forum: No registered users and 1 guest