1st Law for an Adiabatic, Closed System
The total energy of the system is a state variable.
But in this system, the only way to change the total energy is through work.
So, can work still be a path variable?
Application of the
First Law of Thermodynamics
Consider an
adiabatic
,closed system
.Closed System
No mass crosses the boundary of the system.
No mass crosses the boundary of the system.
Adiabatic
No heat transfer occurs across the boundary of the system (Q = 0)
No heat transfer occurs across the boundary of the system (Q = 0)
Therefore, the only form of energy which crosses the system boundary is work.
W
ΔE
Insulation 
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