in the first law of thermodynamics, △E = Q-w, what does △E stand for?
Athe work done by the piston
Bthe internal energy of the system
Cthe heat added to the system
Dthe change in the internal energy of the system
Athe work done by the piston
Bthe internal energy of the system
Cthe heat added to the system
Dthe change in the internal energy of the system