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Expansion

Posted: Thu Feb 01, 2018 12:20 pm
by Jasmine Botello 2F
When the temperature is constant and pressure and volume are both changing, this means that work is being done BY the system right? aka expansion? or am I missing something?

Re: Expansion

Posted: Thu Feb 01, 2018 3:03 pm
by Lucian1F
If the volume is expanding then the system is doing work

Re: Expansion

Posted: Thu Feb 01, 2018 4:11 pm
by Brandon Fujii 1K
In the internal energy equation

Delta U = q+w

our w value would be negative because the w is work done by the surroundings (system does work to expand)

Re: Expansion

Posted: Thu Feb 01, 2018 8:54 pm
by William Xu Dis 1D
It would depend on how the pressure and volume are changing. If the pressure is external, the surroundings are performing work on the surroundings. If you are referring to the internal pressure of the system, then if the pressures or volume increases, then the system is doing work. If the volume increases, it is called expansion work.