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Closed system

Posted: Sat Feb 06, 2016 11:15 am
by WeiyangXiong1B
Why is a LED lightbulb a closed system?

Re: Closed system

Posted: Sat Feb 06, 2016 4:32 pm
by Chem_Mod
Because matters cannot be exchanged. The bulb is sealed completely. However, energy can still be exchanged.

Re: Closed system

Posted: Fri Jan 13, 2017 2:42 pm
by GregoryPolyakov_1H
But in trying to calculate something, do we assume the system is closed or isolated?

Re: Closed system

Posted: Fri Jan 13, 2017 3:56 pm
by Josephine_Tang_1N
I would assume the system is isolated because thermodynamic problems calculate changes in energy